Whatever fosters the growth of civilization works at the same time against war.

Dreams are the guardians of sleep and not its disturbers.

In mourning it is the world which has become poor and empty; in melancholia it is the ego itself.

I consider it a good rule for letter-writing to leave unmentioned what the recipient already knows, and instead tell him something new.

Out of your vulnerabilities will come your strength.

Woe to you, my Princess, when I come. I will kiss you quite red and feed you till you are plump. And if you are froward, you shall see who is the stronger, a gentle little girl who doesn't eat enough, or a big wild man who has cocaine in his body. -- A love letter from Freud to his fiancée.

The division of the psychical into what is conscious and what is unconscious is the fundamental premise of psycho-analysis; and it alone makes it possible for psycho-analysis to understand the pathological processes in mental life, which are as common as they are important, and to find a place for them in the framework of science.