"Repenting means revising one's judgment and changing one's plan of action. God never does this; he never needs to, for his plans are made on the basis of a complete knowledge and control which extend to all things past, present and future, so that there can be no sudden emergencies or unexpected developments to take him by surprise....What God does in time, he planned from eternity. And all that he planned in eternity he carries out in time. And all that he has in his Word committed himself to do will infallibly be done. Thus we read of "the immutability of his counsel" to bring believers into full enjoyment of their promised inheritance, and of the immutable oath by which he confirmed this counsel to Abraham, the archetypal believer, both for Abraham's own assurance and for ours too (Heb 6:17-18). So it is with all God's announced intentions. They do not change. No part of his eternal plan changes....
Jesus Christ is "the same yesterday and today and forever" (Heb 13:8), and his touch has still its ancient power. It still remains true that "he is able to save completely those who come to God through him, because he always lives to intercede for them: (Heb 7:25). He never changes. This fact is the strong consolation of all God's people."
-J. I. Packer, Knowing God, p. 80
