"Beautiful things may be admired, if not loved," asserted the Tin Man. "Flowers are beautiful, for instance, but we are not inclined to marry them. Duty, on the contrary, is a bugle call to action, whether you are inclined to act, or not. In this case, I obey the bugle call of duty."

The Tin Woodman of Oz, Chapter 2, "The Heart of the Tin Woodman" (1918) - Later Oz novels