War, weapons and victory

The best weapons are the most nefarious instruments
that beings detest.
Those who follow the Dao shun them.

Weapons are evil instruments,
they are not noble instruments.
Only out of necessity will he resort to them,
for he loves peace and calm.
So he does not celebrate victory.
He who celebrates victory
rejoices in slaughter.
Such a person should not rule in the world.

When a multitude has been killed,
one should mourn and weep.
Therefore, victory in a war should be celebrated like a funeral.

(Laozi, Dao De Jing 31)