Doubt is the key to knowledge.

Epigrams succeed where epics fail.

If one has to jump a stream and knows how wide it is, he will not jump. If he does not know how wide it is, he will jump, and six times out of ten he will make it.

Do little things now; so shall big things come to thee by and by asking to be done.

The loveliest faces are to be seen by moonlight, when one sees half with the eye and half with the fancy.

He who knows he who knows not, and knows not that he knows not, is a fool, shun him; He who knows not, and knows that he knows not, is a child, teach him. He who knows, and knows not that he knows, is asleep, wake him. He who knows, and knows that he knows, is wise, follow him.