Who wrote judge a man not by what he read but rereads?

The quote "Judge a man by what he reads, not by what he says he reads" is attributed to William Lyon Phelps, an American professor of English literature at Yale University.

It's important to note that the exact wording of the quote can vary, but the core idea remains the same: true knowledge and intellectual depth are revealed not by what one claims to have read, but by what they genuinely engage with and revisit.