Recompense injury with justice and recompense kindness with kindness.
Attack the evil that is within yourself, rather than attacking the evil that is in others.
Yin and yang, male and female, strong and weak, rigid and tender, heaven and earth, light and darkness, thunder and lightning, cold and warmth, good and evil…the interplay of opposite principles constitutes the universe.
The superior man understands what is right; the inferior man understands what will sell.
When a wise man points at the moon the imbecile examines the finger.
The hardest thing of all is to find a black cat in a dark room, especially if there is no cat.