One who has drunk at the fountain of spiritual happiness says good-by of his own accord to the satisfactions that come from a higher professional status … What is the greatest sign of success for a teacher thus transformed? It is to be able to say, "The children are now working as if I did not exist."
Ch. 27 : The Teacher's Preparation, p. 283; part of this has become paraphrased as : - The Absorbent Mind (1949)