What does the Bible say about God's sovereignty in choosing?

Deuteronomy 7:6 emphasizes God's sovereign choice in selecting Israel as His special people. This sovereignty is pivotal in Reformed theology, illustrating that it is God who decides who belongs to Him, not based on any merit or number but purely by His grace and purpose. The doctrine underscores God's absolute authority in salvation and His selective love towards those He has chosen, indicating that before the foundation of the world, God set His love upon His people, ensuring their redemption through Christ.