Oliver Wendell Holmes, Jr. Quote
The last thing an old teacher wants is, as you know full well, a new set of terms for a familiar set of objects. It is hard instructing ancient canine individuals in new devices. It is hard teaching old professors new tricks.
Letter to Dr. Wilder, May 30, 1881, Proceedings of the American Philosophical Society Held at Philadelphia, Volume XIX, July 15, 1881 (p. 530)