Sforno on Deuteronomy 6:2/ספורנו על דברים ו׳:ב׳

1למען תירא את ה' אלוקיך, for you will remember then that He is the owner of the earth you till, and that you are considered as aliens, or at best as resident strangers by Him.

2אתה, ובנך, ובן בנך. This is a reminder that even the generations who had not been eyewitnesses to G’ds powerful miracles will learn to revere Him when they accept the commandments, as you have seen.

3ולמען יאריכון ימיך, and in order that these commandments (their performance) acquire for you your ticket to the world after death, a world in which there is only long, infinite life.