Does the conclusion certainly follow if the premises be true?
-- Augustus De Morgan (19th C)
My own text on
Good Logic Books starts since many years thus:
The most important single capacity human beings have is the capacity to reason
logically - to know that from given premisses,
whether believed or not, follows something with necessity if these premisses
There are several reasons why this is the most
important single capacity human beings have:
Some reasons why logic is of fundamental human(e)
It is at the
foundations of all human inferences, and therewith of human survival
It is at the
foundations of peaceful, rational and reasonable social change and all
language, logic is what makes human beings really different from other
animals: only human beings can seek peaceful agreement on what may be the
case and what may be done by rational discussion
logic, computers are hard to think of, design, built or maintain
As it happens, I am not well and yesterday I gave a series of quotes
On the human predicament, which is
especially when combined with
wishful thinking -
and today I have a a series of
quotes that may explain to some whence my
logic, that is quite rare, and that I found better
quite a few ways, than ever before, in a very nice pdf file that I found
by way of Logic Matters, a site by
Peter Smith who teaches
logic in Cambridge
This is by a professor David Marans and I like it a lot.
Basically, it is a series of slides each made up of a quotation of a
thinker about logic, an image of the thinker (usually), and some brief
remarks plus a relevant link. 
Thus, it is easy to read, in principle; not a large read
at all; with quite a few interesting pictures I did not know e.g. of a
young Henri Poincaré and young Saul Kripke; and all quotes showing,
stating or implying clearly what logic really is about.
So here goes for many of the
quotations, that I hope may
go some way explaining why I really
logic, since first really
finding it around 1969 - and it is a bit difficult to say exactly when
because I had become conscious of my strong interest in logic when 15,
when I decided that what I was most intereested in was human reasoning in
all its forms, for many reasons also, as illustrated by the quotations,
but in 1969 I first read Beth and Tarski, who were both great
mathematical logicians and fine philosophers, who also did very important
work in mathematical logic , whence my selecting that year.
Also, I should say much of this was very joyful to
discover: At long last human beings who reason well... for which reason
it should be remarked that I have a proletarian background
and did not go
to fine schools with fine teachers, nor had I any private instruction but
what I could give myself through hunting for interesting books and
writers about interesting subjects. (Incidentally, I had a similar
response - after being exposed to school mathematics, which was extremely
badly thought , when first reading
Heath's translation, and
Archimedes: So THIS is what mathematics is...
why did nobody TELL me?! )
Now... quotes from the
In correct logic,
certain things are supposed, and something else results of
To follow the scent of an animal, the hunting dog
uses this logic:
“The animal went either by this road, or by that, or by the
other: but it did not go by this nor that, thus it went the other
-- Chrysippus (3rd C B.C.)
To fly from logic
is to be a true fugitive.
-- Marcus Aurelius (2nd C)
This, therefore, is
Logic: She reminds you of the invisible form of the
soul; She gives light to her own discoveries; She awakens the
mind and purifies the intellect; She brings light to our
intrinsic ideas; She abolishes oblivion and ignorance which are
ours by birth.
-- Proclus Diadochus (5th C)
Some concepts (truth, being, necessity) cannot be
clarified beyond the clarity of the concepts themselves. For all
other concepts, Logic
is the science of the methods by which we acquire them.
-- Al-Farabi (10th C)
Logic is the
science of the forms of thinking that are valid and the forms
that are invalid.
-- Ibn Sani = Avicenna (11th C)
There is no other way to learn the truth than
-- Averroes (12th C)
Consequently one who wishes to attain to human
perfection must thus first study Logic.
-- Moses Maimonides (12th C)
Logic is the
beginning of wisdom.
-- Thomas Aquinas (13th C)
One who is learns the principles of
logic and then
carefully studies other sciences, will thereby develop even
greater in the art of logic.
-- William of Ockham (14th C)
Those who establish argument by noise and command
show that their reason is weak.
-- Michel de Montaigne (16th C)
judgment, and invention, a person may do great matters.
-- Francis Bacon (17th C)
the rules for all the operations of the mind, exists for the very
purpose of being an instrument which is of service to us.
-- Antoine Arnauld (17th C)
The best defense against
logic is ignorance.
-- Blaise Pascal (17th C)
is the anatomy of thought.
-- John Locke (17th C)
This art of logic
concerns all kinds of reasoning in which inferences are
executed by their form.
-- Gottfried Leibniz (17th C)
Logic is the art
which directs the mind in its acquisition of knowledge.
-- Frances Hutcheson (17th C)
Logic helps us
to strip off the outward disguise of things, and to behold and
judge them in their own nature.
-- Isaac Watts
And having arrived here, barely one third of the way into
the Logic Gallery I stop
for the moment, having ME and
I may later take some more and indeed add some comments,
but as it is I strongly recommend you - IF you like ANY of the above
quotations - to get the Logic
Gallery, find out more, and follow the links given there.
Some final observations
I noticed some avid reading in
4 chapter 17 Of reason
which indeed is quite appropriate...
... as is this list of logic books I read (next to very
Good Logic Books
... that are well worth reading and studying...
... and should like to add that there is material
for at least 20 Ph.D. theses on my sites, in various subjects and
sciences also, but that someone like me is not allowed to finish
studying philosophy at the University of Amsterdam, by its Boartd of
Directors and the Dean of the Faculty of Philosophy, and may not
take the Ph.D. because my
published opinions are both true and tested as true by two
Parliamentarian Investigations, but a man like me, with a
family background like mine in Holland an Amsterdam, deserves to get NO
help whatsoever with anything whatsoever, since I am an invalid with ME
and have many opinions that are
"offensive to Dutch (..)
such as lately telling the truth about the massive Dutch collaboration
during World War II.
Finally in this context, having
myself a marked weakness for the man, who must have had one of the
best minds I ever had the pleasure to read, here is a bit of text from
the Logic Gallery about
Ockham (my added link):
Among the most highly regarded scholars of the late middle
Best known for
Ockham’s Razor: “For
explanation, use no more hypotheses than necessary.”
Argues that Logical Forms are simply human
abstraction and have no reality in themselves.
His theological views were considered
heretical. Papal authority confined him in a monastary.
Spent much of his adult life in France and
Germany, seeking freedom to think and write.
Often had to live in hiding.
Was then excommunicated and the spent the remainder of his
life amongst a band fugitives.
- quoted from professor David Marans, also to show the
reader what his comments in the
Logic Gallery are like.
And indeed, I myself did - unknowingly, driven by
native wit and love for true understanding - precisely
as Ockham counseled, from age
for which reason I could so easily see through
the lies, pretensions and
lack of civilisation at the University of Amsterdam, where I as
early as 1977, a week or so after starting to study philosophy there,
with a marxist father and
mother, and brn in an Amsterdam proletarian family of
communist resistance heroes,
was told that I must be 'something like a fascist' to say that
personally I considered
a far greater philosopher than
For which reason, and the courage of saying so while
being an invalid, I was removed three times from the University of
Amsterdam, as the only Dutch person since World War II ended,
as the Board of Directors
detailed in writing (still available in court, if desired) because
"outspoken ideas about the level of governance,
education and research in this university"
In 2008 the Dutch Parliamentary Investigation Committee
Dijsselbloem published a report that implies that I have been right all
the time - but I am not heard, not answered, not received, not
telephoned with by either the corrupt and incompetent members of the
Board of Directors of the University of Amsterdam nor by the corrupt
and incompetent former mayor of Amsterdam Job Cohen, who I have been
asking for 10 years to reply to me: He rather sees me die, gassed,
murdered or suicide because of the constant pain and no help I get,
also while he has been in power, and in spite of my asking and asking
and asking again...
... so since I am now not even allowed to discuss Dutch collaboration
in World War II on American forums by sick degenerate Dutchmen, it
would seem, because if I write the truth about the Dutch collaboration
in World War II, including that of David Cohen and Abraham Asscher of
De Joodsche Raad, I am discriminated as a matter of course, also as if
it is my fault that I tell the truth and insist on my right and
capacity to do so, I'll be changeing my tactics shortly, for I want my
damages restituted and I do not want to live in a country which, it
seems, in a few months will be PM'd either by an protector of the
drugs-mafia and the chief of the metro-scam that cost Amsterdam sofar
over 2 billion Euros or else by an Aryanly hairdyed neo-fascist type
with issues, since it is this manner of men the Dutch in vast majority
applaud and admire, while persecuting their critics, preferably - as
the great Dutch writer
Multatuli wrote, having received the same
treatment - by pelting such a one with stones as he tries to swim with
a ball of lead the Dutch corrupt bureaucrats have tied to him for
protesting their corruption, quite honorably and truly as well...
P.S. What should be done about
drugs in Holland,
that have been semi-legally available there since the late sixties of the
previous century? As I have said - and been saying ad nauseam since the
late sixties: Legalize them, control their quality, tax them, and have
the more dangerous one's only on doctor's recipe.
Simple, easy, easily implemented with one simple legal
change that would completely conform to the existing situation, as is
since decades (anyone can get and deal any illegal drug in Holland
without being effectively stopped, hindered or controlled) BUT for the
fact that especially Amsterdam mayors and aldermen and police commanders
are against it because it has a guaranteed 20
billion Euros turnover in Holland, EACH YEAR, DECADE AFTER DECADE,
as semi-legal, untaxed, unchecked, uncontrolled substances, that are
PERFECTLY fit for corruption of anybody that comes to a position of any
power in and around Amsterdam.
Were it different, I would have been received in
Amsterdam by mayor and aldermen, been protected against murder threates,
and been awarded damages. Instead, they chose to try to kill me by the
not so subtle instrument of refusing systematically any help whatsoever
while I have been seriously ill since decades because of what they
allowed their drugsdealing terrorists do to me, while trying to drive me
to suicide by forcing me to work while knowing I can't.
Worse than fascists, these sanctimonious hypocritical
Amsterdam willing servants of the mafia in the name of the ideals of the
February Strike - for they did not live in a totalitarian climate or war:
They just were corrupt for money and cruel for pleasing malicuous lying
degenerate human natures.
O, and as it happens, I can identically repeat from yesterday
(another British logical mind Marans so far missed):
P.P.S. Well... that got longer than I thought. And
had I mentioned
... yes, so I did:
Yodeling for Beginners
(<- page 25 - presently at ->
(latest issue - one: ME humor - The Laughter
Process (tm) CoFIBS at work).
And some of the evidence that Herr Professor & Frau Doctor Wessely vom
Weasel zum Weisel are mentally
sane if and only if (iff) I am not - as they wholly agree, miraculously
But see here which of the two logical alternatives a true iff comprehends
1. Ten reasons why ME is a real disease by a professor
of medicine of Harvard.
2. Long essay by a professor emeritus of medical chemistry about
maltreatment of ME.
3. Explanation of what's happening around ME by an investigative
4. Report to Canadian Government on ME, by many medical experts.
5. Advice to psychiatrist by a psychiatrist who understands ME is an
6. English mathematical genius on one's responsibilities in the matter
of one's beliefs:
is wrong always, everywhere, and for anyone, to believe anything upon
7. A space- and computer-scientist takes a look at psychology.
8. Malcolm Hooper puts things together status 2010.
me! alas, pain, pain ever, forever!
No change, no pause, no hope! Yet I endure.
I ask the Earth, have not the mountains felt?
I ask yon Heaven, the all-beholding Sun,
Has it not seen? The Sea, in storm or calm,
Heaven's ever-changing Shadow, spread below,
Have its deaf waves not heard my agony?
Ah me! alas, pain, pain ever, forever!"
- (Shelley, "Prometheus Unbound")
"It was from this time that I developed my way of judging the
Chinese by dividing them into two kinds: one humane and one not. "
 As it happens one gets a site
professor David Marans where one can download the Logic_Gallery_4.3.pdf -
probably in construction or a WIP, one guesses.
And bit curiously, the
Logic Gallery was first named
Logic Matters - which,
as it happens, also is the name of an excellent collection of logical
essays by Peter Geach,
as Peter Smith no doubt knows.
Anyway, it's all excellent stuff by any name or
 As I said in the previous note,
it's probably a WIP (Work In Progress) and I miss several notable names,
from whose texts fine quotes could have been culled, such as
(see also: Frank Ramsey - A
Comprehensive Resource: One of the great losses to mathematics and
philosophy, since he died when 26), and others I could - and maybe will,
but not now, as I am not well - name.
Semantical Tableaux and
Theory of Truth. (Four interesting references, who those who think
Logic Matters )
 By a Mr Guyot, and ex-seaman, who had stayed on land
and taught maths because he had passed a school for seafaring men than
qualified him to do so, then. His contribution to the science of
mathematics that I called The Law Of Guyot was an often with great care
chalked Mathematical Law on the blackboard, in several colors, with
underlining, by a special big ruler: "A Parallelogram = A Parm".
The class had him five hours every week, and every hour
started with the same question and answer:
Have you made your homework?!
(Pulling special notebook from pocket, with special
pencil, with satisfaction:)
 Most introductions to mathematics are little or no
good> The following are very good but both in three volumes - a
good university library ought to have them:
"last Ph.D. student was
Grigori Perelman, who in 2002 made a breakthrough in the proof
Thurston's geometrization conjecture, which contains the
Poincaré conjecture as a special case."
(Wikipedia, as the other links
in this note).
Also, as I was talking about The
Human Predicament yesterday: The most intelligent persons I have read
or met where all mathematicians.
 Not because I was
provocative in any way, or had indicated my own background in any way (I
never did this in the UvA, except sometimes privately, to a chosen
few, although had I lied with the majority I'd probably have been a
double professor now at the University of Amterdam, and a probably
revered public speaker... but no: Je ne regrette rien: I did not
give the lie to my mind, o lying
posturing corrupt hypocritical assholes of my generation!)
This scolding and totalitarianism was simply
the style of the whole
place, where corrupt ignorant lying careerists from the Dutch
Labour Party, the Dutch Communist
Party, and lately the Dutch Green Party have had the very
well-paid professorships in Pure BullShit carried after them for the
taking, as so many knighthoods a 1000 years ago - and note that all
academics in totalitarian Holland are (were then) appointed as
civil servants for life,
so that the government can control them and
they learn to lick politician's ass
properly, in the
Politically Correct way also.
For the readers of Dutch here is your instruction leaflet
how to make it in Holland:
Be a real lying corrupt sadistic lying bastard and
you'll be mayor, alderman, parliamentarian or minister
real soon, even without having worked
one serious day of your life, while knowing nothing than bullshit and
formulating it brokenly and idiotically like a neurotic ass (our present
PM Balkenende excells in this), and having no talents or tastes or real
knowledge or abilities whatsoever except for getting rich by deceiving
and hurting others:
There are no civilised Dutchmen who can make it to any
position of any real power, for the control to all position of any real
power is carefully guarded by the bastards who have fought their way to
the top already, and only allow true and tested bastards of their own
kind on their own level of governance:
Supplements on ME