What is predestination ?
It is God’s predetermining all reasonable beings, whether angels or men, to an everlasting domain either of salvation or damnation. 1 Thess 5:9
9 For God hath not appointed us to wrath, but to obtain salvation by our Lord Jesus Christ,
So predestination is comprised of two aspects:
Election, which is God’s sovereign choosing some men to salvation through Christ. “And that he might make known the riches of his glory on the vessels of mercy, which he had afore prepared unto glory.” {Rom 9:23} “Having predestinated us unto the adoption of children by Jesus Christ to himself, according to the good pleasure of his will.” {Eph1:5}
Reprobation, which is God’s sovereign choosing some, both men and Angels, to destruction. There are some vessels “to dishonor.” {2 Tim 2:20} “To shew his wrath, and to make his power known, endured with much longsuffering the vessels of wrath fitted to destruction.” {Rom 9:22}