How do we know the concept of adoption in Christ is true?

The theological concept of adoption is rooted in Scripture, particularly articulated in Ephesians 1:5, which indicates that God predestined believers for adoption as His children through Jesus Christ. This is part of God's eternal plan, where before the foundation of the world, He chose a people to be holy and blameless in His sight. Adoption in Christ underscores our intimate relationship with God, as it signifies that we are not only saved from condemnation but also granted the privilege of being called His children. This profound truth changes our status before God, placing us into a loving relationship fueled by the love of the Father for His beloved Son.