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

Philosophers
William James
Born in New York in 1842, William James laid the intellectual foundations of both psychology and philosophy in America. He established the country's first psychology course in 1875, earning the title 'father of American psychology,' and co-founded pragmatism with Peirce. His concept of the 'stream of consciousness' influenced literature as well as science, and The Varieties of Religious Experience reframed religion as personal inner experience.
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William James's Other Quotes
The true is the name of whatever proves itself to be good in the way of belief, and good, too, for definite, assignable reasons.
The art of being wise is the art of knowing what to overlook.
The greatest discovery of my generation is that a human being can alter his life by altering his attitudes of mind.
Be not afraid of life. Believe that life is worth living, and your belief will help create the fact.
A great many people think they are thinking when they are merely rearranging their prejudices.
Related Quotes
Think on the shop floor; act on the shop floor.
-- Sakichi Toyoda
Waste no more time arguing about what a good man should be. Be one.
-- Marcus Aurelius
The best architect is time, which always reveals the truth.
-- Gian Lorenzo Bernini
Don't tell me I can't do it; don't tell me it can't be done.
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You don't learn to walk by following rules. You learn by doing, and by falling over.
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It is hard to retain what you learn unless you practice it.
-- Seneca