Tao Te Ching 68
One who excels as a warrior does not appear formidable;
One who excels in fighting is never roused in anger;
One who excels in defeating his enemy does not join issue;
One who excels in employing others humbles himself before them.
This is known as the virtue of non-contention;
This is known as making use of the efforts of others;
This is known as matching the sublimity of heaven.