I have no extraordinary ability. I'm simply an inquisitive individual.

It is the supreme art of the teacher to awaken joy in creative expression and knowledge.

People should be more like animals . . . they should be more intuitive; they should not be too conscious of what they do while they do it.

... one does people the best service by giving them some elevating work to do and thus indirectly elevating them.

Common sense is nothing more than a deposit of prejudices laid down by the mind before you reach eighteen.

Relativity applies to physics, not ethics.

If someone feels that he has never made a mistake in his life, it only means that he has never tried anything new in his life.