There are two different conceptions about the nature of the universe: (1) the world as a unity dependent on humanity; (2) the world as a reality independent of the human factor.

It is my inner conviction that the development of science seeks in the main to satisfy the longing for pure knowledge.

I no longer believed in the known God of the Bible, but rather in the mysterious God expressed in nature.

Reason is intuition's servant.

Marriage is but slavery made to appear civilized.

Pure mathematics is, in its way, the poetry of logical ideas.

Insanity: doing the same thing over and over again and expecting different results.