There are two tragedies in life. One is to lose your heart's desire. The other is to gain it.
No man who is occupied in doing a very difficult thing, and doing it very well, ever loses his self-respect.
Progress is impossible without change, and those who cannot change their minds cannot change anything.
The moment we want to believe something, we suddenly see all the arguments for it, and become blind to the arguments against it.
Success does not consist in never making mistakes but in never making the same one a second time.
A life spent making mistakes is not only more honourable, but more useful than a life spent doing nothing.
Marriage is an alliance entered into by a man who can't sleep with the window shut, and a woman who can't sleep with the window open.