There are two tragedies in life. One is to lose your heart's desire. The other is to gain it.
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.
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.
A life spent making mistakes is not only more honourable, but more useful than a life spent doing nothing.