The great secret of true success, of true happiness, is this: the man or woman who asks for no return, the perfectly unselfish person, is the most successful.

Happiness isn't a constant. You get fleeting glimpses. You have to fight for those moments, but they make it all worth it.

Over the years, those who have seemed to me to be the most happy, contented and fulfilled have always been the people who have lived the most outgoing and unselfish lives.

They must often change who would be constant in happiness or wisdom.

There is joy in work. There is no happiness except in the realization that we have accomplished something.

The necessary thing for anyone to be happy and contented as long as he lives is working for the ones who will come after him rather than working for himself... One can reach the true delight and happiness in the life only by working for the existence, honor, and happiness of the future generations.