“It is the stupidest children who are most childish and the stupidest grown-ups who are most grown-up.”

Acceptance Speech for the Margaret Edwards Award (1998)
Context: I've always believed that there is no subject that is taboo for the writer. It is how it is written that makes a book acceptable, as a work of art, or unacceptable and pornographic. There are many books circulating today, for the teen-ager as well as the grown up, which would not have been printed in the fifties. It is still amazing to me that A Wrinkle In Time was considered too difficult for children. My children were seven, ten, and twelve while I was writing it, and they understood it. The problem is not that it's too difficult for children, but that it's too difficult for grown ups. Much of the world view of Einstein's thinking wasn't being taught when the grown ups were in school, but the children were comfortably familiar with it.

1930s, Mortals and Others (1931-35)

Source: Nova (1968), Chapter 3 (p. 44)

"An Unread Book," introduction to The Man Who Loved Children by Christina Stead (Holt, Rinehart, 1965 edition)
General sources

From a review of Malcolm Muggeridge's The Thirties, in New English Weekly (25 April 1940)
Context: It is all very well to be "advanced" and "enlightened," to snigger at Colonel Blimp and proclaim your emancipation from all traditional loyalties, but a time comes when the sand of the desert is sodden red and what have I done for thee, England, my England? As I was brought up in this tradition myself I can recognise it under strange disguises, and also sympathise with it, for even at its stupidest and most sentimental it is a comelier thing than the shallow self-righteousness of the left-wing intelligentsia.

Source: Culture and Value (1980), p. 17e