<p>4:6- see on Mk. 14:36; Rom. 8:15; Jude 20.</p><p><i>And because you are sons, God sent the Spirit of His Son into our hearts, crying, Abba, Father</i>- Note this was said to the apostate Galatians. The work of God's Spirit was still active within them, and they were still to be treated as His beloved sons. Clearly at the point of commitment to Christ in baptism, the Spirit is sent into the heart of the believer; a psychological strengthening, enabling us to feel towards God as the Lord Jesus did, addressing Him as the Lord did: Abba, Father. This strange method of addressing God was characteristic of Jesus, and must've been very noticeable and provoked much wonder and comment. Thus we are being told that His characteristic personal style of relationship with the Father is now ours; and this is very much the idea of His discourse about the Comforter. See on 3:2.</p>