הלכה על יומא 76:21

Aside from this, the following (Midrash Rabbah 14:4) is well known: "If you have labored much in their [the sages'] words, the Holy One Blessed be He removes the yetzer hara from you" — whereupon I said to myself: "Possibly, if they study this book, which is gathered from all the words of the Rishonim on this subject, and reflect upon them, the yetzer hara for this sin will not prevail so much over them." And, as a mater of course, if one starts to remove himself from this sin, he will come to remove himself from it entirely. For in this sin, habit plays a great part, and (Yoma 38b) "One who comes to purify himself is assisted [by the L–rd]." And in this merit, may the Redeemer [the Messiah] come to Zion," (Isaiah 50:29), speedily, in our days, Amen!