Rabbi Tzaddok would say, “Do not make [the Torah] into a crown to glorify oneself nor into a spade with which to dig”; [Similarly,] Hillel would say [the same idea] as follows: “Whoever uses the crown will disappear.” That is to say, anyone who had gratification from the words of the Torah, his life is taken from the world.
One of these vorts I heard from a rabbi I love and it goes as follows: רבי צדוק אומר, לא תעשם עטרה להתגדל בהם, ולא קורדום לחפור בהם: כך היה הלל אומר, ודישתמש בתגא חלף; הא כל הנהנה מדברי תורה, נטל חייו מן העולם.