Conjugal love, or the friendship of spouses, persists after sexual desires have weakened, withered, and disappeared.

Emancipation of human labor from economic servitude and exploitation, i.e., from organizations of production in which the conditions of work are determined by a master class who own the means of production, and in which the fruits of work are alienated from workers to the benefit of masters.

Unless we love and are loved, each of us is alone, each of us is deeply lonely.

Habits are formed by the repetition of particular acts. They are strengthened by an increase in the number of repeated acts. Habits are also weakened or broken, and contrary habits are formed by the repetition of contrary acts.

Freedom is the emancipation from the arbitrary rule of other men.

You have to allow a certain amount of time in which you are doing nothing in order to have things occur to you, to let your mind think.

If you ask a living teacher a question, he will probably answer you. If you are puzzled by what he says, you can save yourself the trouble of thinking by asking him what he means. If, however, you ask a book a question, you must answer it yourself. In this respect a book is like nature or the world. When you question it, it answers you only to the extent that you do the work of thinking an analysis yourself.