C.N. Douglas, comp. Forty Thousand Quotations: Prose and Poetical. 1917.


Logic is the armory of reason.

Thomas Fuller.

Logic works; metaphysic contemplates.


Logic is the art of convincing us of some truth.

La Bruyère.

Logic helps us to strip off the outward disguise of things, and to behold and judge of them in their own nature.

Dr. Watts.

Logic is to grammar what the sense of words is to their sound.


Logic differeth from rhetoric as the fist from the palm; the one close, the other at large.


Talk logic with acquaintances, and practise rhetoric in your common talk.


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


If a man can play the true logician, and have judgment as well as invention, he may do great matters.


Logic and metaphysics make use of more tools than all the rest of the sciences put together, and do the least work.


The knowledge of the theory of logic has no tendency whatever to make men good reasoners.


Logic is the essence of truth, and truth is the most powerful tyrant; but tyrants hate the truth.


For me, who only desire to become wise, not more learned or eloquent, these logical or Aristotelian dispositions of parts are of no use.


Logic is the art of thinking well: the mind, like the body, requires to be trained before it can use its powers in the most advantageous way.

Lord Kames.

  • He was in logic a great critic,
  • Profoundly skill’d in analytic;
  • He could distinguish and divide
  • A hair ’twixt south and south-west side.
  • Butler.

    It was a saying of the ancients, “Truth lies in a well;” and to carry on this metaphor, we may justly say that logic does supply us with steps, whereby we may go down to reach the water.

    Dr. I. Watts.

    Men are apt to mistake the strength of their feeling for the strength of their argument. The heated mind resents the chill touch and relentless scrutiny of logic.


    Logic is the science of the laws of thought, as thought,—that is of the necessary conditions to which thought considered in itself is a subject.

    Sir W. Hamilton.