How do we know that God's choice of His people is true?

The doctrine of election is foundational in Reformed theology, supported by passages such as Ephesians 1:4-5, which states that God chose us in Christ before the foundation of the world. This selection is rooted in God's sovereign will and purpose, not based on any foreseen merit or action from individuals. In the vision from Zechariah, the Lord's declaration of Joshua as a chosen one exemplifies how God chooses and redeems His people. This ensures that salvation is entirely by grace, reinforcing that it is God's power and initiative, not human effort, that brings about our redemption and keeps us secure in Him.