From The Velveteen Rabbit by Margery Williams:
"Real isn't how you are made," said the Skin Horse. "It's a thing that happens when a child loves you. It takes a long time. Generally, by the time you are Real, most of your hair has been loved off, you get loose in the joints, and very shabby."
"Does it hurt?" asked the Rabbit.
"Sometimes," said the Skin Horse. "But when you are Real you don't mind being hurt."