Hear, see, and be silent.

The worthless usually live long.

Exaggeration is a prodigality of the judgment which shows the narrowness of one's knowledge or one's taste.

You have to appear wiser and more prudent than is required by the people you are dealing with if you want to give a high opinion of yourself.

Self knowledge is the beginning of self improvement.

Let him that hath no power of patience retire within himself, though even there he will have to put up with himself.

The sole advantage of power is that you can do more good.