And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father.
Note 9 at Ga 4:6: One of the benefits of being God's son is receiving the indwelling of His Holy Spirit. This allows the believer to address God the Father in the same manner that Jesus did (Mr 14:35-36). The word "Abba" is an Aramaic word used by Jesus (Mr 14:36), and it carries the idea of God being our "daddy" (see note 29 at Mt 6:9). It is a term used for intimacy and affectionate fondness. It removes the idea of God as our strict Judge and carries the idea of Him being a loving Father who cares, understands, and is our best friend.