Genesis 27, How does Isaac have the ability to give such a powerful blessing to Jacob?

Question: How does Isaac have the ability to give such a powerful blessing to Jacob?  Did God give this ability to speak these words over his son and they would come true?  If Isaac had spoken this blessing over Esau would it have been just as binding? Answer: Isaac was speaking prophetically, just like the prophets. These were God's words, that is why they were powerful and fulfilled. God spoke through Isaac because of his position as father in the home. What if it had been Esau? We do not know, but perhaps God would have given Isaac different words like He did to Balaam in Numbers 23-24. -PJ