Logic Quotes

Histories make men wise; poets, witty; the mathematics, subtile; natural philosophy, deep; moral, grave; logic and rhetoric, able to contend.

Francis Bacon ‘Essays’ (1625) ‘Of Studies’

‘Contrariwise,’ continued Tweedledee, ‘if it was so, it might be; and if it were so, it would be: but as it isn’t, it ain’t. That’s logic.’

Lewis Carroll ‘Through the Looking-Glass’ (1872) ch. 4

Some people are aware of another sort of thinking which…leads to those simple ideas that are obvious only after they have been thought of…the term ‘lateral thinking’ has been coined to describe this other sort of thinking; ‘vertical thinking’ is used to denote the conventional logical process.

Edward de Bono 1933—

The grape that can with logic absolute
The two-and-seventy jarring sects confute.

Edward Fitzgerald ‘The Rubáiyát of Omar Khayyám’ (1859) st. 43

Mathematics may be defined as the subject in which we never know what we are talking about,
Nor whether what we are saying is true.

Bertrand Russell “Mysticism and Logic” (1917) ch. 4

The law of causality, I believe, like mud that passes muster among philosophers, is a relic of a
Bygone age, surviving, like the monarchy, only because it is erroneously supposed to do no harm.

Bertrand Russell “Mysticism and Logic” (1919)

Logic must take care of itself.

Ludwig Wittgenstein

Against logic there is no armor like ignorance.

Laurence J. Peter

Better to be without logic than without feeling.

Charlotte Bronte

Chess is not only knowledge and logic.

Alexander Alekhine

Dialectic thought is an attempt to break through the coercion of logic by its own means.

Theodor Adorno

Fear is a disease that eats away at logic and makes man inhuman.

Marian Anderson

Grammar is the logic of speech, even as logic is the grammar of reason.

Richard Chenevix Trench

Hope is independent of the apparatus of logic.

Norman Cousins

Human beings lose their logic in their vindictiveness.

Elizabeth Cady Stanton

I think Latin has some logic to it and there was a discipline.

Sanford I. Weill

In life, particularly in public life, psychology is more powerful than logic.

Ludwig Quidde

Insanity is often the logic of an accurate mind overtasked.

Oliver Wendell Holmes

Insolence is not logic; epithets are the arguments of malice.

Robert Green Ingersoll