Experience fails to teach where there is no desire to learn.
Progress is impossible without change, and those who cannot change their minds cannot change anything.
No man who is occupied in doing a very difficult thing, and doing it very well, ever loses his self-respect.
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.
Some men see things as they are and ask why. Others dream of things that never were and ask why not.
Success does not consist in never making mistakes but in never making the same one a second time.