The one who blesses becomes an agent of self-realization and fulfillment for the one who receives the blessing. We "conjure" a blessing. Even for God. And when we "bless" God, since God is the source of all life, we effectively enable the Holy One to bless us. In blessing God, we are blessing ourselves!
The one who offers a blessing is like a coach whispering to an athlete before a competition, "You can do it!" More than encouragement, positive spin, or sincere wish, the words of blessing literally bring forth and make real an otherwise unrealizable force. In this way, blessing is not supplication but symbiosis. God needs us to summon blessings, just as we could not live without them.— Lawrence Kushner, Nehemia Polen in Filling Words With Light