You ask me if I keep a notebook to record my great ideas. I've only ever had one.

Do things sound better in your head before you say them, or do you even run them through there first?

From a certain temperature on, the molecules 'condense' without attractive forces; that is, they accumulate at zero velocity. The theory is pretty, but is there some truth in it.

A human being is a part of the whole called by us universe, a part limited in time and space. He experiences himself, his thoughts and feeling as something separated from the rest, a kind of optical delusion of his consciousness. This delusion is a kind of prison for us, restricting us to our personal desires and to affection for a few persons nearest to us. Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty.

I speak to everyone in the same way, whether he is the garbage man or the president of the university.

I have no special talent. I am only passionately curious. The important thing is to not stop questioning. Curiousity has its own reason for existing.

If a man aspires towards a righteous life, his first act of abstinence is from injury to animals.