May G-d, G-d of your forefathers add to you
a thousand times over. May He bless you as
He spoke concerning you.
Deuteronomy 1:11
G-d had promised Abraham that He would multiply his offspring without limit. Why, then, did Moses seemingly impose a thousand-fold limit to G-d’s blessing?
The answer is that Moses knew that G-d desires our prayers and that our prayers and fervent desire are what elicits Divine beneficence. Moses therefore spoke this way in order to spur the people to ask for what they knew they had been promised, teaching them the power of prayer.
Similarly, we should never underestimate the power of our prayers. Moreover, like Moses, we should remind others of the power of their prayers, encouraging them to request G-d’s blessings whenever they are needed.
--Daily Wisdom Volume 3