The great revolution of the future will be Nature's revolt against man.
Forgive everybody but yourself.
Those who seek happiness miss it, and those who discuss it, lack it.
As soon as an idea is accepted it is time to reject it.
Only one-fourth of the sorrow in each man's life is caused by outside uncontrollable elements, the rest is self-imposed by failing to analyze and act with calmness.
There are only two classes in society: those who get more than they earn, and those who earn more than they get.