Sforno on Deuteronomy 31:12/ספורנו על דברים ל״א:י״ב

1למען ישמעו, in order that the wise men in the congregation would understand.

2ולמען ילמדו, and in order that the less intelligent members of the people would learn it from them.

3ויראו את ה' אלוקיכם, once they have understood the greatness of Torah they will automatically revere and be in awe of its author, G’d, whose supreme intelligence they will admire.