Election [or choosing] is God’s unchangeable purpose by which he did the following:
Before the foundation of the world, by sheer grace, according to the free good pleasure of his will, he chose in Christ to salvation a definite number of particular people out of the entire human race, which had fallen by its own fault from its original innocence into sin and ruin. Those chosen were neither better nor more deserving than the others, but lay with them in the common misery. He did this in Christ, whom he also appointed from eternity to be the mediator, the head of all those chosen, and the foundation of their salvation. And so he decided to give the chosen ones to Christ to be saved, and to call and draw them effectively into Christ’s fellowship through his Word and Spirit. In other words, he decided to grant them true faith in Christ, to justify them, to sanctify them, and finally, after powerfully preserving them in the fellowship of his Son, to glorify them.
God did all this in order to demonstrate his mercy, to the praise of the riches of his glorious grace.
As Scripture says, God chose us in Christ, before the foundation of the world, so that we should be holy and blameless before him with love; he predestined us whom he adopted as his children through Jesus Christ, in himself, according to the good pleasure of his will, to the praise of his glorious grace, by which he freely made us pleasing to himself in his beloved (Eph. 1:4-6). And elsewhere, Those whom he predestined, he also called; and those whom he called, he also justified; and those whom he justified, he also glorified (Rom. 8:30).