Great spirits have always encountered violent opposition from mediocre minds.

Most people say that it is the intellect which makes a great scientist. They are wrong: it is character.

It gives me great pleasure indeed to see the stubbornness of an incorrigible nonconformist warmly acclaimed.

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

A table, a chair, a bowl of fruit and a violin what else does a man need to be happy?

The devil has put a penalty on all things we enjoy in life. Either we suffer in health or we suffer in soul or we get fat.

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

If people are good only because they fear punishment, and hope for reward, then we are a sorry lot indeed.

Imagination is more important than knowledge.

Imagination is everything. It is the preview of life's coming attractions.