Just do what must be done. This may not be happiness, but it is greatness.
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.
Beauty is all very well at first sight; but who ever looks at it when it has been in the house three days?
Success does not consist in never making mistakes but in never making the same one a second time.