The poor ego has a still harder time of it; it has to serve three harsh masters, and it has to do its best to reconcile the claims and demands of all three...The three tyrants are the external world, the superego, and the id.
Sigmund FreudThe voice of the intellect is a soft one, but it does not rest until it has gained a hearing.
Sigmund FreudLook into the depths of your own soul and learn first to know yourself, then you will understand why this illness was bound to come upon you and perhaps you will thenceforth avoid falling ill.
Sigmund Freud