Ti Tzu Kui/chapter 5

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    Hence that general is skilful in attack whose opponent does not know what to defend; and he is skilful in defense whose opponent does not know what to attack.
    —Sun Tzu (6th–5th century B.C.)

    Theory may be deliberate, as in a chapter on chemistry, or it may be second nature, as in the immemorial doctrine of ordinary enduring middle-sized physical objects.
    Willard Van Orman Quine (b. 1908)