There is an intelligent way to eat a live frog - I just don't know what it is.

Spies cannot be usefully employed without a certain intuitive sagacity.

If I wish to engage, then the enemy, for all his high ramparts and deep moat, cannot avoid engagement; I attack that which he is obliged to rescue.

Should the enemy strengthen his van, he will weaken his rear; should he strengthen his rear, he will weaken his van; should he strengthen his left, he will weaken his right; should he strengthen his right, he will weaken his left. If he sends reinforcements everywhere, he will everywhere be weak.

If those who are sent to draw water begin by drinking themselves, the army is suffering from thirst.

Know the enemy and know yourself.

Correct your mistake as soon as you have found it.