“4 For we know, brothers loved by God, that he has chosen you, 5 because our gospel came to you not only in word, but also in power and in the Holy Spirit and with full conviction.” – 1 Thessalonians 1:4-5
BTW NOTE: We know our election through personal conviction of sin and personal faith in Christ. These things are the evidence of the eternal counsel of God pressing in on our hearts and lives. These things = you were chosen by God before the foundation of the world.
A Pilgrim's Theology 