Imagination is more important than knowledge. For knowledge is limited to all we now know and understand, while imagination embraces the entire world, and all there ever will be to know and understand.

The history of scientific and technical discovery teaches us that the human race is poor in independent and creative imagination.

The only thing that interferes with my learning is my education.

Non-cooperation in military matters should be an essential moral principle for all true scientists.

If I had known they were going to do this, I would have become a shoemaker.

A conflict arises when a religious community insists on the absolute truthfulness of all statements recorded in the Bible. This means an intervention on the part of religion into the sphere of science; this is where the struggle of the Church against doctrines of Galileo and Darwin belongs.

I am not an atheist. I do not know if I can define myself as a pantheist. The problem involved is too vast for our limited minds.