Romans 9:8-18

That is, it is not the children of the body [Abraham’s natural descendants] who are God’s children, but it is the children of the promise who are counted as [Abraham’s true] descendants. For this is what the promise said: “About this time [next year] I will come, and Sarah shall have a son.” [Gen 18:10] And not only that, but this too: Rebekah conceived twin sons by one man [under the same circumstances], by our father Isaac; and though the twins were not yet born and had not done anything either good or bad, so that God’s purpose [His choice, His election] would stand, not because of works [done by either child], but because of [the plan of] Him who calls them, it was said to her, “The older (Esau) will serve the younger (Jacob).” [Gen 25:21-23] As it is written and forever remains written, “Jacob I loved (chose, protected, blessed), but Esau I hated (held in disregard compared to Jacob).” [Mal 1:2, 3] What shall we say then? Is there injustice with God? Certainly not! For He says to Moses, “I will have mercy on whomever I have mercy, and I will have compassion on whomever I have compassion.” [Ex 33:19] So then God’s choice is not dependent on human will, nor on human effort [the totality of human striving], but on God who shows mercy [to whomever He chooses—it is His sovereign gift]. For the Scripture says to Pharaoh, “I raised you up for this very purpose, to display My power in [dealing with] you, and so that My name would be proclaimed in all the earth.” [Ex 9:16] So then, He has mercy on whom He wills (chooses), and He hardens [the heart of] whom He wills.