They Wouldn’t Let Him Browse the Seforim
Reb Shneur Zalman Fradkin, known as the “Gaon of Lublin” or by his sefer “Toras Chesed”, was a chossid of the Tzemach Tzedek and an exceptional genius. The seforim seller only allowed him to look at the cover pages, since once he flipped through a sefer, he knew it by heart.