All intelligent thoughts have already been thought; what is necessary is only to try to think them again.

Art is long, life short, judgment difficult, opportunity transient. To act is easy, to think is hard; to act according to our thought is troublesome. Every beginning is cheerful: the threshold is the place of expectation.

Thinking is more interesting than knowing, but less interesting than looking.

Once you have missed the first buttonhole, you'll never manage to button up.

We usually lose today, because there has been a yesterday, and tomorrow is coming.

Nothing is more dangerous than solitude.

He is happy as well as great who needs neither to obey nor to command in order to be something.