This is a time, when there seems to be a particular need for friends of wisdom and truth to join together.

If someone feels that he has never made a mistake in his life, it only means that he has never tried anything new in his life.

Any fool can know. The point is to understand.

I am strongly drawn to a frugal life and am often oppressively aware that I am engrossing an undue amount of the labor of my fellow men.

The creative principle [of science] resides in mathematics.

The word God is for me nothing more than the expression and product of human weaknesses.

Feeling and longing are the motive forces behind all human endeavor and human creations.