I found it in an article on the problem with education ("The Lost Tools of Learning") presented by Miss Dorothy Sayers at Oxford in 1947. You can read the whole here.
That I, whose experience of teaching is extremely limited, should presume to discuss education is a matter, surely, that calls for no apology. It is a kind of behavior to which the present climate of opinion is wholly favourable. Bishops air their opinions about economics; biologists, about metaphysics; inorganic chemists, about theology; the most irrelevant people are appointed to highly technical ministries; and plain, blunt men write to the papers to say that Epstein and Picasso do not know how to draw.