...and not to celebrate victory

Those who assist a leader by means of the Tao do not use arms to coerce the world, for these things tend to reverse- brambles grow where an army has been, bad years follow a great war.
Weapons are inauspicious instruments, not the tools of the enlightened. When there is no choice but to use them, it is best to be calm and free from greed, and not to celebrate victory. Those who celebrate victory are bloodthirsty, and the bloodthirsty cannot have their way with the world.

-Tao-te Ching