When Esau said, ‘Bless me, reverse the blessing to Jacob; bless me also’, Isaac answers, ‘No, my son. No, I was going to bless you wrongly, the blessing has been stolen from you, but it's right it should have been, and I am guilty before God.
Did Esau try to repent and fail? We have the commentary on Scripture on this appeal by Esau to his father: ‘Lest there be any fornicator, or profane person, as Esau, who for one morsel of meat sold his birthright. For ye know how that afterward, when he would have inherited the blessing, he was rejected: for he found no place of repentance, though he sought it carefully with tears’ (Hebrews 12:16-17). The repentance which Esau sought was not his own, but Isaac’s. This passage does not teach that a man may earnestly try to repent and fail because his repentance is not accepted. The meaning of the passage is that Esau tried to get Isaac to change his mind and to bless him rather than his brother. But Isaac would not repent or change his mind about what he had already done. Even his favourite son’s tears could not induce him to do so.