Even when a person is frightened by threats into doing something, the threats work only because the person has an instinct of fear. If he has not, or if, though having it, it is under his own control, the threat has no more influence upon him than light has in causing a person to see who has no eyes.

Democracy and Education: An Introduction to the Philosophy of Education (ed. Library of Alexandria, 1938) - ISBN: 9781465525406