How do we know our adoption as sons is true?

The assurance of our adoption as sons comes from Galatians 4:6, which states that God sent the Spirit of His Son into our hearts so that we might call Him 'Abba, Father.' This dual relationship reveals both our status as children of God and the intimate connection we have with Him. The presence of the Holy Spirit confirms our identity as heirs and equips us to live as God's children, highlighting the transformative aspect of grace in our lives. It assures us of our salvation and the certainty of our inheritance as members of His family.