Opportunities multiply as they are seized.

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.

In the midst of difficulties we are always ready to seize an advantage, we may extricate ourselves from misfortune.

Know the enemy and know yourself.

To ... not prepare is the greatest of crimes; to be prepared beforehand for any contingency is the greatest of virtues.

These are six ways of courting defeat, which must be carefully noted by the general who has attained a responsible post.

Order or disorder depends on organisation and direction; courage or cowardice on circumstances; strength or weakness on tactical dispositions.