he who will not economize will agonize

He who learns but does not think, is lost. He who thinks but does not learn is in great danger.

How should I know anything about another world when I know so little of this?

The man who asks a question is a fool for a minute, the man who does not ask is a fool for life.

It is better not to proceed at all than to proceed without purpose.

See a person's means ... Observe his motives. Examine that in which he rests. How can a person conceal his character?

Never contract friendship with a man that is not better than thyself.