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

The number of laws is constantly growing in all countries and, owing to this, what is called crime is very often not a crime at all, for it contains no element of violence or harm.

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

When a man begins to know himself a little he will see in himself many things that are bound to horrify him. So long as a man is not horrified at himself he knows nothing about himself.

There is something in us that keeps us where we find ourselves. I think this is the most awful thing of all.

Truths that become old become decrepit and unreliable; sometimes they may be kept going artificially for a certain time, but there is no life in them.

When one realises one is asleep, at that moment one is already half-awake.