As I write, there is a craze for what is called psychoanalysis, or the cure of diseases by explaining to the patient what is the matter with him: an excellent plan if you happen to know what is the matter with him, especially when the explanation is that there is nothing the matter with him.

Suppose the world were only one of God's jokes, would you work any the less to make it a good joke instead of a bad one?

A day's work is a day's work, neither more nor less, and the man or woman who does it needs a day's sustenance, a night's repose and due leisure, whether they be painter or ploughman.

Treat a friend as a person who may someday become your enemy; an enemy as a person who may someday become your friend.

Trade unionism is not socialism. It is the capitalism of the proletariat.

Science is always simple and always profound. It is only the half-truths that are dangerous.

The only service a friend can really render is to keep up your courage by holding up to you a mirror in which you can see a noble image of yourself.