The individual does actually carry on a double existence: one designed to serve his own purposes and another as a link in a chain, in which he serves against, or at any rate without, any volition of his own.

If you want to endure life, prepare yourself for death.

In the last analysis the entire field of psychology may reduce to biological electrochemistry.

By abolishing private property one deprives the human love of aggression.

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

Where does a thought go when it's forgotten?

Neither in my private life nor in my writings, have I ever made a secret of being an out-and-out unbeliever.