Opportunities increase as they are taken.

He who wishes to fight must first count the cost. When you engage in actual fighting, if victory is long in coming, then men's weapons will grow dull and their ardor will be dampened. If you lay siege to a town, you will exhaust your strength.

The nature of war is constant change.

Sweat more during peace: bleed less during war

In making tactical dispositions, the highest pitch you can attain is to conceal them.

There are routes not to be followed, armies not to be attacked, citadels not to be besieged, territory not to be fought over.

There has never been a protracted war from which a country has benefitted.