Dreams are the guardians of sleep and not its disturbers.

The ego represents what we call reason and sanity, in contrast to the id which contains the passions.

Religious illusion must bow to scientific truth. It is in total error about the nature of the true world. Only science is not an illusion.

Thinking in pictures is, therefore, only a very incomplete form of becoming conscious. In some way, too, it stands nearer to unconscious processes than does thinking in words, and it is unquestionably older than the latter both ontogenetically and phylogenetically.

In human beings pure masculinity or femininity is not to be found either in a psychological or biological sense.

From error to error one discovers the entire truth.

I no longer count as one of my merits that I always tell the truth as much as possible; it has become my metier.