What we think, or what we know, or what we believe is, in the end, of little consequence. The only consequence is what we do.

John Ruskin

The most perfidious way of harming a cause consists of defending it deliberately with faulty arguments.

Friedrich Nietzsche

You must not think me necessarily foolish because I am facetious, nor will I consider you necessarily wise because you are grave.

Sydney Smith

When a stupid man is doing something he is ashamed of, he always declares that it is his duty.

George Bernard Shaw