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LOGIC
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[ Also see Argument Common Sense Fallacy Mathematics Metaphysics Method Mind Philosophy Proof Reason Rhetoric Science Sophistry Thought Truth ]

I told him it was law logic--an artificial system of reasoning, exclusively used in courts of justice, but good for nothing anywhere else.
      - attributed to John Quincy Adams,
        to John Marshall

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

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

O Logic: born gatekeeper to the Temple of Science, victim of capricious destiny: doomed hitherto to be the drudge of pedants: come to the aid of thy master, Legislation.
      - Jeremy Bentham,
        "Works" by J. Browning (ed.)

You can only find truth with logic if you have already found truth without it.
      - Gilbert Keith Chesterton,
        The Man who was Orthodox

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

From a drop of water a logician could predict an Atlantic or a Niagara.
      - Sir Arthur Conan Doyle, A Study is Scarlet

It is a capital mistake to theorize before one has data.
      - Sir Arthur Conan Doyle, Scandal in Bohemia

Logic, like whiskey, loses its beneficial effect when taken in too large quantities.
      - Lord Dunsany,
        "The World of Mathematics" edited by J.R. Newman

Logic is the armory of reason.
      - Thomas Fuller (1)

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.
      - Rt. Hon. William Ewart Gladstone

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 William Hamilton (3)

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.
      - Henry Home, Lord Kames

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

Logic works; metaphysic contemplates.
      - Joseph Joubert

Fallacious and misleading arguments are most easily detected if set out in correct syllogistic form.
      - Immanuel Kant

Logic is the essence of truth, and truth is the most powerful tyrant; but tyrants hate the truth.
      - Eugene Arthur Kozlay (f/k/a Jeno Kozlay)

Logic is the art of going wrong with confidence.
      - Joseph Wood Krutch

Logic is the art of convincing us some truth.
      - Jean de la Bruyere

After this, therefore because of this.
  [Lat., Post hoc ergo propter hoc.]
      - Latin Phrases

With this, therefore because of this.
  [Lat., Cum hoc ergo propter hoc.]
      - Latin Phrases

Logic is the anatomy of thought.
      - John Locke (1)

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

In almost every case except the very plainest, it would be possible to decide the issue either way with reasonable legal justification.
      - Hugh Macmillan, Lord Macmillan

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


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