The Rebbe blesses the Bar Mitzvah boy to grow in Torah, Chassidus, and mitzvah observance, becoming a Chassid, yerei Shamayim, and lamdan. He encourages continued success in teaching Chassidus publicly and reflects on the depth of Torah revealed at Matan Torah.
https://www.torahrecordings.com/rebbe/igroskodesh/015/010/5496