How do we know that God saves people?

The doctrine of effectual calling teaches that God, in His sovereign grace, draws certain individuals to Himself, resulting in their faith and repentance. This is rooted in scriptures such as Romans 8:29-30, which outlines the Golden Chain of Redemption where those He foreknew, He also predestined, called, justified, and glorified. God's call is effective; it accomplishes what it intends. This grace is not based on any foreseen merit or action from individuals but solely on God's divine will, as demonstrated in 2 Timothy 1:9, highlighting that He has saved us and called us according to His purpose and grace.