The good man is the teacher of the bad, And the bad is the material from which the good may learn. He who does not value the teacher, Or greatly care for the material, Is greatly deluded although he may be learned. Such is the essential mystery.
LaoziWithout going out-of-doors, one can know all he needs to know. Without even looking out of his window, one can grasp the nature of everything. Without going beyond his own nature, one can achieve ultimate wisdom. Therefore, the intelligent man knows all he needs to know without going away, And sees all he needs to see without looking elsewhere, And does all he needs to do wihout undue exertion.
Laozi