Conscience is the inner voice that warns us somebody may be looking.
H. L. Mencken (1880 - 1956), A Mencken Chrestomathy (1949)
It's a rare person who wants to hear what he doesn't want to hear.
Dick Cavett (1936 - )
I won't take my religion from any man who never works except with his mouth.
Carl Sandburg (1878 - 1967)
There is still a difference between something and nothing, but it is purely geometrical and there is nothing behind the geometry.
Martin Gardner (1914 - ), "The Mathematical Magic Show"