George Bernard Shaw
Progress is impossible without change, and those who cannot change their minds cannot change anything.
The liar's punishment is not in the least that he is not believed, but that he cannot believe anyone else.
It is a curious sensation: the sort of pain that goes mercifully beyond our powers of feeling. When your heart is broken, your boats are burned: nothing matters any more. It is the end of happiness and the beginning of peace.
A little learning is a dangerous thing, but we must take that risk because a little is as much as our biggest heads can hold.
Beware of the man who does not return your blow: he neither forgives you nor allows you to forgive yourself.
A man of great common sense and good taste - meaning thereby a man without originality or moral courage.