The most difficult thing is to know what we do know, and what we do not know.

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

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.

In all living nature (and perhaps also in that which we consider as dead) love is the motive force which drives the creative activity in the most diverse directions.

In existing criminology there are concepts: a criminal man, a criminal profession, a criminal society, a criminal sect, and a criminal tribe, but there is no concept of a criminal state, or a criminal government, or criminal legislation. Consequently what is often regarded as "political" activity is in fact a criminal activity.

The strangest and most fantastic fact about negative emotions is that people actually worship them.

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.