Only strong characters can resist the temptation of superficial analysis.

The opinion prevailed among advanced minds that it was time that belief should be replaced increasingly by knowledge; belief that did not itself rest on knowledge was superstition, and as such had to be opposed.

I know that the most joy in my life has come to me from my violin.

Playfullness is the essential feature of productive thought.

In the middle of every difficulty lies opportunity.

Empathy is patiently and sincerely seeing the world through the other person's eyes. It is not learned in school; it is cultivated over a lifetime.

All these constructions and the laws connecting them can be arrived at by the principle of looking for the mathematically simplest concepts and the link between them.