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Logic is like the sword -- those who appeal to it, shall perish by it.

Samuel Butler (1612-1680) British poet and satirist.

Logic is a poor guide compared with custom.

Winston Churchill (1874-1965) British politician.

Reason can wrestle and overthrow terror.

Euripides (BC 480-BC 406) Greek tragic poet.

Logic works, metaphysics contemplates.

Joseph Joubert (1754-1824) French moralist.

Logic is the anatomy of thought.

John Locke (1632-1704) English philosopher.

Reason also is choice.

John Milton (1608-1674) English poet.

The logic of the world is prior to all truth and falsehood.

Ludwig Wittgenstein (1889-1951) Austrian-British philosopher.

Logic takes care of itself; all we have to do is to look and see how it does it.

Ludwig Wittgenstein (1889-1951) Austrian-British philosopher.