A crab does not give birth to a bird.

The mediocre teacher tells. The good teacher explains. The superior teacher demonstrates. The great teacher inspires.

We ought not to let either our joy at their faults or our grief at their success be idle, but in either case we ought to reflect, how we may become better than them by avoiding their errors, and by imitating their virtues not come short of them.

A man has to learn that he cannot command things, but that he can command himself; that he cannot coerce the wills of others, but that he can mold and master his own will: and things serve him who serves Truth; people seek guidance of him who is master of himself.