All happiness depends on courage and work. I have had many periods of wretchedness, but with energy and above all with illusions, I pulled through them all.

Few men are raised in our estimation by being too closely examined.

I am not deep, but I am very wide.

Most geometricians, chemists, mathematicians, and great scientists submit religion to reason only to discover a problem as unsolvable as that of squaring a circle.

Bankers are lynxes. To expect any gratitude from them is equivalent to attempting to move the wolves of the Ukraine to pity in the middle of winter.

Does not any limit imposed upon one inspire a desire to go beyond it? Does not our keenest suffering arise when our free will is crossed?

A man who stops at nothing short of the law is very clever indeed!