You stay young as long as you can learn, acquire new habits, and suffer contradictions.

If there be a faith that can move mountains, it is faith in one's own power.

Whoever prefers the material comforts of life over intellectual wealth is like the owner of a palace who moves into the servants’ quarters and leaves the sumptuous rooms empty.

To be satisfied with little is hard, to be satisfied with a lot is impossible.

A book cannot easily be too bad for the general public, but may easily be too good.

What you wish to do you are apt to think you ought to do.

There are times when to be reasonable is to be cowardly.