A good example is the best sermon.

Experience is the best teacher, but a fool will learn from no other.

The best way to teach people is to be a good example.

You can always learn from others, whether they are good examples or not.

If you teach a poor young man to shave himself, and keep his razor in order, you may contribute more to the happiness of his life than in giving him a thousand guineas.

Learn of the skilful; he that teaches himself, has a fool for his master.