Ground which can be freely traversed by both sides is called accessible.

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.

Sweat more during peace: bleed less during war

When torrential water tosses boulders, it is because of its momentum. When the strike of a hawk breaks the body of its prey, it is because of timing.

Thus the skilful general conducts his army just as though he were leading a single man, willy-nilly, by the hand.

If the mind is willing, the flesh could go on and on without many things.

He who relies solely on warlike measures shall be exterminated; he who relies solely on peaceful measures shall perish.