Which is it: is man one of God's blunders, or is God one of man's blunders? Twilight of the Idols

If your enemy is secure at all points, be prepared for him. If he is in superior strength, evade him. If your opponent is temperamental, seek to irritate him. Pretend to be weak, that he may grow arrogant. If he is taking his ease, give him no rest. If his forces are united, separate them. If sovereign and subject are in accord, put division between them. Attack him where he is unprepared, appear where you are not expected. The Art Of War

That books do not take the place of experience, and that learning is no substitute for genius, are two kindred phenomena; their common ground is that the abstract can never take the place of the perceptive. The World As Will and Representation

In our monogamous part of the world, to marry means to halve one's rights and double one's duties. Parerga and Paralipomena