Hitler's movement is near to Mohammedanism.

Nobody can fall so low unless he has a great depth. If such a thing can happen to a man, it challenges his best and highest on the other side; that is to say, this depth corresponds to a potential height, and the blackest darkness to a hidden light.

Archetypes resemble the beds of rivers: dried up because the water has deserted them, though it may return at any time. An archetype is something like an old watercourse along which the water of life flowed for a time, digging a deep channel for itself. The longer it flowed the deeper the channel, and the more likely it is that sooner or later the water will return.

Astrologers are influenced by theosophy, so they say, "That is very simple, it is just vibration!" ... But what is vibration? They say it is light energy, perhaps electricity, they are not quite informed. At all events the vibrations that could influence us have never been seen, so it remains just a word.

The word 'belief' is a difficult thing for me. I don't believe. I must have a reason for a certain hypothesis. Either I know a thing, and then I know it - I don't need to believe it.

The serious problems in life...are never fully solved. If ever they should appear to be so it is a sure sign that something has been lost. The meaning and purpose of a problem seem to lie not in its solution but in our working at it incessantly.

The psychiatrist knows only too well how each of us becomes the helpless but not pitiable victim of his own sentiments. Sentimentality is the superstructure erected upon brutality.