Toil of science swells the wealth of art.

A sublime soul can rise to all kinds of greatness, but by an effort; it can tear itself from all bondage, to all that limits and constrains it, but only by strength of will. Consequently the sublime soul is only free by broken efforts.

Wise to resolve, patient to perform.

The world is ruled only by consideration of advantages.

We can never replace a friend. When a man is fortunate enough to have several, he finds they are all different. No one has a double in friendship.

In a narrow circle the mind grows narrow. The more one expands, the larger their aims.

Every true genius is bound to be naive.