Some people think that if they did something beautiful yesterday, or last week, or even several years ago, they’ve done their part and G‑d should continue paying them for it the rest of their lives.
It’s something like loaning money with interest—you lent it to someone last year, and you’re still making a profit off him today.
Problem is, the Torah prohibits charging interest—even from G‑d.
Instead, go into business with G‑d. He values the good that you did. You should value it also. And if you do, you’ll make each day a new investment.
Yesterday was good. Today will be even better.

HaShem has invested in me today. He has created this day and all that comes with it, including me. What will I offer Him in return? What good can I make of the gift I have received? What opportunity to be of service awaits me? He has given me everything? He owes me nothing. I owe Him everything? Shouldn't it be my best? Every opportunity to perform a mitzvah is merely an opportunity to say thank you! And thanks to you rabbi for this opportunity to reflect on this!