Look deep into nature, and then you will understand everything better.

Non-cooperation in military matters should be an essential moral principle for all true scientists.

The greatest tragedy of human existence is the illusion of separateness.

Concerning matter, we have been all wrong. What we have called matter is energy, whose vibration has been so lowered as to be perceptible to the senses. There is no matter.

Weakness of attitude becomes weakness of character.

It is not a lack of real affection that scares me away again and again from marriage. Is it a fear of the comfortable life, of nice furniture, of dishonor that I burden myself with, or even the fear of becoming a contented bourgeois.

Mozart's music is so pure and beautiful that I see it as a reflection of the inner beauty of the universe.