How do we know that election and adoption are based on God's grace?

The doctrine of election and adoption is rooted in the sovereign grace of God, as stated in Ephesians 1:4-5, which teaches that we are chosen in Christ before the foundation of the world for adoption as sons. This election is not based on any prior knowledge of our faith or actions, but solely on God's will, as articulated in Matthew 11:26, where Jesus affirms that God's choices align with His good pleasure. Therefore, our inclusion in God's family is solely a matter of divine grace, highlighting God's mercy and the work of Christ in redemption.