So I cut it short. Who made the choice, when and why, is quite clear. The result of that choice or the benefits of said choice are irrelevant. Your simply trying to create a rabbit trail.
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Those spoken of in Eph 1:4 were chosen
in Christ that they should be holy and blameless.
Ephesians 1:1–14 (LEB) — 1 Paul, an apostle of Christ Jesus by the will of God, to the saints who are in Ephesus and faithful
in Christ Jesus: 2 Grace to you and peace from God our Father and the Lord Jesus Christ. 3 Blessed is the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places
in Christ, 4 just as he chose us
in him before the foundation of the world,
that we should be holy and blameless before him in love, 5 having predestined us to adoption through Jesus Christ to himself according to the good pleasure of his will, 6 to the praise of the glory of his grace that he bestowed on us
in the beloved, 7
in whom we have redemption through his blood, the forgiveness of sins, according to the riches of his grace, 8 that he caused to abound to us in all wisdom and insight, 9 making known to us the mystery of his will, according to his good pleasure that he purposed
in him, 10 for the administration of the fullness of times, to bring together all things
in Christ, the things in the heavens and the things on the earth,
in him 11
in whom also we were chosen, having been predestined according to the purpose of the One who works all things according to the counsel of his will, 12 that we who hoped beforehand
in Christ should be for the praise of his glory, 13
in whom also you, when you heard the word of truth, the gospel of your salvation, in whom also
when you believed you were sealed with the promised Holy Spirit, 14 who is the down payment of our inheritance, until the redemption of the possession, to the praise of his glory.
Every blessing is a result of being
in Christ
Before the foundation of the world, this is what God determined concerning those who would be in Christ.
He did not determine who would be in Christ
If you did not understand that the determination concerned what would be the destiny of those who believed in Christ,