Humanistic ethics is based on the principle that only humans themselves can determine the criterion for virtue and not an authority transcending us.

Love and knowledge led upwards to the heavens.

What is new in our time is the increased power of the authorities to enforce their prejudices.

To discover a system for the avoidance of war is a vital need of our civilisation.

Physics, owing to the simplicity of its subject matter, has reached a higher state of development than any other science.

I had supposed until that time that it was quite common for parents to love their children, but the war persuaded me that it is a rare exception. I had supposed that most people liked money better than almost anything else, but I discovered that they liked destruction even better. I had supposed that intellectuals frequently loved truth, but I found here again that not ten per cent of them prefer truth to popularity.

I believe that when I die I shall rot, and nothing of my ego will survive.