How do we know that God chooses His people for salvation?

According to Scripture, God's sovereign choice in salvation is a key aspect of Reformed theology. 2 Thessalonians 2:13 states, "But we are bound to give thanks alway to God for you, brethren beloved of the Lord, because God hath from the beginning chosen you to salvation through sanctification of the Spirit and belief of the truth." This underscores that salvation is not a result of human will or effort but rather stems from God's electing grace, which operates according to His divine purpose. Furthermore, the concept of God's elect is affirmed throughout the Bible, reinforcing that His choice is sure and eternal, giving believers a solid foundation for their faith.