Like the physical, the psychical is not necessarily in reality what it appears to us to be.

If the truth of religious doctrines is dependent on an inner experience that bears witness to the truth, what is one to make of the many people who do not have that experience?

Religion [is] the universal obsessional neurosis of humanity

If youth knew; if age could.

Dreams are the royal road to the unconscious.

In the depths of my heart I can’t help being convinced that my dear fellow-men, with a few exceptions, are worthless.

In every age immorality has found no less support in religion than morality has. If the achievements of religion in respect to man's happiness, susceptibility to culture and moral control are no better than this, the question cannot but arise whether we are not overrating its necessity for mankind, and whether we do wisely in basing our cultural demands upon it.