The Rebbe reminds a veteran educator that the essence of Jewish education—especially in Eretz Yisrael—is instilling fear of Hashem and observance of mitzvos in every subject taught. He encourages the teacher to carry this goal in heart and mind, highlighting the merit of his illustrious ancestry and influence on many.
https://www.torahrecordings.com/rebbe/igroskodesh/015/010/5541