How do we know that God chooses to save some people?

The doctrine of unconditional election asserts that God, in His sovereignty, has chosen certain individuals for salvation before the foundation of the world. This is rooted in passages such as Ephesians 1:4-5, which states that He chose us in Christ before the foundation of the world, highlighting that our salvation is not based on our merit, but on God's sovereign grace. This should bring great comfort to believers, knowing that salvation is entirely a result of God's infinite wisdom and love, and not dependent on our actions or decisions.