It is not based on us, anything in us, or upon foreseen works, and it is an election to salvation (not simply to service). This makes us really humble because we know it has nothing to do with us. We have no reason to boast except in Christ.
Eph 1:4
even as he chose us in himbefore the foundation of the world, that we should be holy and blameless before him. In love 5 he predestined us for adoption as sons through Jesus Christ, according to the purpose of his will, 6 to the praise of his glorious grace, with which he has blessed us in the Beloved.
Romans 9:11 though they were not yet born and had done nothing either good or bad—in order that God’s purpose of election might continue, not because of works but because of him who calls— 14What shall we say then? Is there injustice on God’s part? By no means! 15 For he says to Moses, "I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion." 16 So then it depends not on human will or exertion, but on God, who has mercy. 17 For the Scripture says to Pharaoh,"For this very purpose I have raised you up, that I might show my power in you, and that my name might be proclaimed in all the earth." 18 So then he has mercy on whomever he wills, and he hardens whomever he wills.
2 Thess 2: 13 But we ought always to give thanks to God for you, brothers beloved by the Lord, because God chose you as the firstfruitsto be saved,
John 6:44 "No one can come to me unless the Father who sent me draws him."
Romans 11:6 But if it is by grace, it is no longer on the basis of works; otherwise grace would no longer be grace. 7 What then?Israel failed to obtain what it was seeking. The elect obtained it, but the restwere hardened,