“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.”

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.