No idea is conceived in our mind independent of our five senses [i.e., no idea is divinely inspired].

What humanity owes to personalities like Buddha, Moses, and Jesus ranks for me higher than all the achievements of the enquiring and constructive mind.

I learned many years ago never to waste time trying to convince my colleagues.

Let me tell you what I look like: pale face, long hair, and a tiny start of a paunch. In addition, an awkward gait, and a cigar in the mouth and a pen in pocket or hand.

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.

Experience is knowledge. All the rest is information.

It is my conviction that pure mathematical construction enables us to discover the concepts and the laws connecting them, which gives us the key to the understanding of nature ... In a certain sense, therefore, I hold it true that pure thought can grasp reality, as the ancients dreamed.