“We know the truth, not only by the reason, but also by the heart.”

All of humanity's problems stem from man's inability to sit quietly in a room alone.

Man is neither angel nor brute, and the unfortunate thing is that he who would act the angel acts the brute.

The heart has its reasons which reason knows nothing of.

Justice without force is powerless; force without justice is tyrannical.

The eternal silence of these infinite spaces terrifies me.

Small minds are concerned with the extraordinary, great minds with the ordinary.