Because he has revealed WHO the chosen are. And it’s not specific individuals. It is everybody who has obeyed the conditions of election. Read 1 Peter 1.
1 Peter 1:1-2 Peter, an apostle of Jesus Christ, to the strangers scattered throughout Pontus, Galatia, Cappadocia, Asia, and Bithynia, Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ: Grace unto you, and peace, be multiplied.
He is writing to the ELECT. They are the elect through “obedience, sanctification, and the blood”. Not because God has just randomly picked out some people.
1 Peter 1:22-23 Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently: Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth for ever.
The ELECT have purified their souls through obedience to the the truth. This IS NOT God hand picking individuals he likes.
1 Peter 1:3 Blessed be the God and Father of our Lord Jesus Christ, which according to his abundant mercy hath begotten us again unto a lively hope by the resurrection of Jesus Christ from the dead,
The elect are those who have been born again. And we know that process comes through water and the Spirit. Jn 3:5. Those who have “purified theirs souls through obeying the truth through the Spirit.
1 Peter 1:14-15 As obedient children, not fashioning yourselves according to the former lusts in your ignorance: But as he which hath called you is holy, so be ye holy in all manner of conversation;
The ELECT are those who have been called. How are we called? Through the gospel. 2 thes 2:13,14
1 Peter 1:18-19 Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold, from your vain conversation received by tradition from your fathers; But with the precious blood of Christ, as of a lamb without blemish and without spot:
The ELECT have been redeemed by the blood of Christ. We know through Eph 1 that redemption is found “in Christ”.eph 1:7 The ELECT are those who are “in Christ”. Gal 3:26-29
Have you been born of water and the Spirit? Have you obeyed the truth of the gospel? Are you “in Christ”. The Bible teaches one is “baptized into Christ”. Rom 6 and Gal 3, 1 Cor 12..
This is who the ELECT are.