A word in earnest is as good as a speech. Bleak House
14. If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle. The Art Of War
We may, indeed, indulge in sport and jest, but in the same way as we enjoy sleep or other relaxations, and only when we have satisfied the claims of our earnest, serious task On Duties
Know yourself and you will win all battles. The Art Of War
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