The patriarch has no blessing of his own to give. We heard Elder LeGrand Richards tell of a patriarch who once said to a woman, I have a wonderful blessing for you. But when the patriarch laid his hands on the head of the recipient, his mind went completely blank. He apologized. I was mistaken. I do not have a blessing for you. It is the Lord who has the blessing for you. The woman came back the next day, and after the patriarch had prayerfully importuned the Lord, a blessing came that mentioned many concerns known only to this good sister. All blessings come from God.