L. Frank Baum Quote

The Tin Woodman knew very well he had no heart, and therefore he took great care never to be cruel or unkind to anything.
"You people with hearts," he said, "have something to guide you, and need never do wrong; but I have no heart, and so I must be very careful. When Oz gives me a heart of course I needn't mind so much."

The Wonderful Wizard of Oz (1900)