G‑d promises the Jewish nation that if they will all be keeping His mitzvahs and toiling in the study of it, the trees will bear their fruits in their seasons, and the earth will yield its bounty.

But is this the reward for keeping mitzvahs? Is this the reward of those who toil to understand it?

Rather, He is telling us, “See how essential is my Torah to the very fabric of existence? It is not just wisdom—it is the essence of all things. You sit and toil to bring its light into your world, and as that light enters, the trees bear their fruits in their season, and the earth yields its bounty!”

Likutei Sichot volume 37, page 82.