Boswell’s Life of Johnson

I would put a child into a library (where no unfit books are) and let him read at his choice. A child should not be discouraged from reading any thing that he takes a liking to, from a notion that it is above his reach. If that be the ease, the child will soon find it out and desist; if not, he of course gains the instruction; which is so much the more likely to come, from the inclination with which he takes up the study.

–James Boswell, quoting Johnson, 1791