Never laugh at live dragons. The Hobbit

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

If happiness lay in bodily pleasures, we would call oxen happy when they find vetch to eat. Fragments

Scientific truth is characterized by its exactness and the certainty of its predictions. But these admirable qualities are contrived by science at the cost of remaining on a plane of secondary problems. leaving intact the ultimate and decisive questions. … Yet science is but a small part of the human mind and organism. Where it stops, man does not stop. History as a System