John Ruskin,
Ariadne Florentina: Six Lectures on Wood and Metal Engraving
“ We are in the careless habit of speaking of men who form a great number of pupils, and have a host of inferior satellites round them, as masters of great schools.But before you call a man a master, you should ask, Are his pupils greater or less than himself? If they are greater than himself, he is a master indeed;—he has been a true teacher. ”
