Genesis 27:38

But one blessing, my father? To be sure, God has unlimited blessings that He is ready to bestow with a lavish hand. Had Esau realized that his defective character disqualified him from receiving the blessing, and that it could be his only through a reversal of attitude, the blessings of God to Abraham and Isaac might have been his also (see Jer. 18:7-12). But it was not with this in mind that Esau spoke. He coveted the blessing without any intention of accepting the obligations that went with it. Like the elder son in the parable of the prodigal, he was jealously unwilling that favor should be shown his younger brother (Luke 15:29).

Esau lifted up his voice, and wept. In response to Esau’s further entreaty, “Hast thou not reserved a blessing for me?” Isaac repeated in substance the blessing pronounced upon Jacob, and told Esau that he could do nothing further for him. When even his father, his best friend, seemed to turn against him, Esau awoke, finally, to the awful realization of his utter rejection by God. His tears expressed sorrow for his loss, but not for the conduct which had made that loss inevitable. His tears were ineffectual because he was no longer capable of true repentance (see Heb. 12:17). Like an impassable chasm, his imperfect character stood between him and the realization of that which now seemed to him of incomparable value (see Jer. 8:20; Luke 16:26; COL 271).