Act as if what you do makes a difference. It does.

Notman Studios (photographer). Public domain · Wikimedia Commons
William James
American philosopher and psychologist who wrote The Principles of Psychology (1890) and The Varieties of Religious Experience. Brother of novelist Henry James; lived 1842–1910.
9 quotes
The art of being wise is the art of knowing what to overlook.
Acceptance of what has happened is the first step to overcoming the consequences of any misfortune.
Be not afraid of life. Believe that life is worth living, and your belief will help create the fact.
The deepest principle in human nature is the craving to be appreciated.
We don't laugh because we're happy — we're happy because we laugh.
A great many people think they are thinking when they are merely rearranging their prejudices.
The greatest discovery of my generation is that a human being can alter his life by altering his attitudes.
There is but one cause of human failure. And that is man's lack of faith in his true self.