One cannot keep all old views and opinions and acquire new ones.

There is no possibility of remembering what has been found and understood, and later repeating it to oneself. It disappears as a dream disappears. Perhaps it is all nothing but a dream.

The problem of Eternity, of which the face of the Sphinx speaks, takes us into the realm of the impossible. Even the problem of Time is simple in comparison with the problem of Eternity.

Understanding is always the understanding of a smaller problem in relation to a bigger problem.

The greatest barrier to consciousness is the belief that one is already conscious.

Possibly the most interesting first impression of my life came from the world of dreams.

I've found that the chief difficulty for most people was to realize that they had really heard new things: that is things that they had never heard before. They kept translating what they heard into their habitual language. They had ceased to hope and believe there might be anything new.