How do we know God saves some and not others?

The doctrine of God's sovereignty in salvation is clearly articulated in Scripture, emphasizing that it is God who chooses individuals for salvation, not the other way around. Revelation 19:1-2 celebrates God's judgments, showcasing that His decisions uphold His justice. In 2 Thessalonians 2:13, it states that God has chosen a people from the beginning to be saved through sanctification of the Spirit and belief in the truth, highlighting that salvation is entirely God's work and not dependent on human decision.