How do we know adoption into God's family is true?

The doctrine of adoption into God's family is rooted firmly in Scripture. Ephesians 1:4-5 and Galatians 4:5 reveal that God has predestined believers for adoption. This act is not based on human merit but solely on God's grace. The acknowledgment that believers can call God their Father is a significant truth that transforms their identity and relationship with Him. Romans 8:15 further confirms this adoption, allowing believers to cry out 'Abba, Father,' emphasizing the intimacy and assurance of their sonship.