The artist who is not also a craftsman is no good; but, alas, most of our artists are nothing else.

Whoever wishes to keep a secret must hide the fact that he possesses one.

The man with insight enough to admit his limitations comes nearest to perfection.

Of the truly creative no one is ever master; it must be left to go its own way.

Do you want to live happily? Travel with two bags, one for giving, the other for receiving.

Where I cannot be moral, my power is gone.

As soon as any one belongs to a narrow creed in science, every unprejudiced and true perception is gone.