A blessing is often remembered for what it promises. This one is remembered for what it recalls. Before Jacob spoke a single word of future over his grandsons, he spoke a word of past. He named the God of his grandfather. He named the God of his father. And then he named the God of his own life — "the Lord who hath fed me since I have been unto this day" (Genesis 48:15).
Targum Pseudo-Jonathan lingers on the image. Abraham served God. Isaac served God. And Jacob — the one who fled, who wrestled, who grieved over Joseph for twenty-two years — was fed. The Aramaic verb evokes a shepherd's care, the daily work of keeping a flock alive. Jacob's life was not easier than his fathers'. He survived Laban, Esau, famine, and a child he believed was dead. He survived, and he ate.
The blessing teaches a simple truth the tradition returns to again and again: gratitude comes before petition. Before you ask God for anything on behalf of the next generation, remember what you have already received. Only then do you have the voice to bless.