Keep your passions in check, but beware of giving your reason free rein.

The ultimate aim of psychoanalysis is to attribute art to mental weakness, and then to trace the weakness back to the point where, according to analytic dogma, it originated namely, the lavatory.

In a hollow head there is much room for knowledge.

There is a cultural taste which tries very hard to get rid of the lice in a fur coat. There is another which tolerates the lice and thinks the coat can be worn with them in it. And finally there is a taste which regards the lice as the most important thing about the coat and consequently places the coat at the lice's disposal.

A comprehensive education is a well-stocked pharmacy: but we have no assurance that potassium cyanide will not be administered fora head cold.

Ideas are transplanted by splitting, thoughts by sprouting.

Anesthesia: wounds without pain. Neurasthenia: pain without wounds.