.Jacob would not change his Mind and neither will God
I should have said Isaac instead of Jacob.
To me the warning in Hebrews 12:17 is obvious. The writer of Hebrews is concerned about apostasy, and repeatedly warns of the consequences:
Hebrews 10:26-31 (NASB)
26. For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, 27. but a terrifying expectation of judgment and the fury of a fire which will consume the adversaries. 28. Anyone who has set aside the Law of Moses dies without mercy on the testimony of two or three witnesses. 29. How much severer punishment do you think he will deserve who has trampled under foot the Son of God, and has regarded as unclean the blood of the covenant by which he was sanctified, and has insulted the Spirit of grace? 30. For we know Him who said, “Vengeance is Mine, I will repay.” And again, “The Lord will judge His people.” 31 It is a terrifying thing to fall into the hands of the living God.
Hebrews 10:39 (NASB)
39. But we are not of those who shrink back to destruction, but of those who have faith to the preserving of the soul.
Hebrews 12:29 (NASB)
29. for our God is a consuming fire.
On 12:17 Adam Clarke comments:
The meaning is not difficult to understand. As with Esau, those who reject the gospel will, at some point, forfeit any opportunity, their situation fixed and fatal, whether in this life or at death. I believe God will always accept repentance in this life, but, even prior to death, a person may become so hardened that for all practical purposes his situation is hopeless.Nothing spoken here by the apostle , nor in the history of Genesis to which he refers, concerns the eternal state of the two brothers. The use made of the transaction buy the apostle is of great importance: take head lest, by apostatizing from the gospel, you forfeit all right and title to the heavenly birthright, and never again be able to retrieve it; because they who reject the gospel reject the only means of salvation.