Galatians 4:6-7

Because you are his sons, God sent the Spirit of his Son into our hearts, the Spirit who calls out, "Abba, Father." So you are no longer a slave, but God's child; and since you are his child, God has made you also an heir. 

God sent the Spirit of his Son 
Acts 16:7  When they came to the border of Mysia, they tried to enter Bithynia, but the Spirit of Jesus would not allow them to.
Romans 8:9  You, however, are not in the realm of the flesh but are in the realm of the spirit, if indeed the Spirit of God lives in you. And if anyone does not have the Spirit of Christ, they do not belong to Christ.
1 Peter 1:10-12  Concerning this salvation, the prophets, who spoke of the grace that was to come to you, searched intently and with the greatest care, trying to find out the time and the circumstances to which the Spirit of Christ in them was pointing when he predicted the sufferings of the Messiah and the glories that would follow. It was revealed to them that they were not serving themselves but you, when they spoke of the things that have now been told you by those who have preached the gospel to you by the Holy Spirit sent from heaven. Even angels long to look into these things.

into our hearts 
Romans 5:5  And hope does not put us to shame, because God's love has been poured out into our hearts through the Holy Spirit, who has been given to us.

the Spirit who calls out "Abba, Father" 
Romans 8:15-16  The Spirit you received does not make you slaves, so that you live in fear again; rather, the Spirit you received brought about your adoption to sonship. And by him we cry, "Abba, Father." The Spirit himself testifies with our spirit that we are God's children.

and since you are his child, God has made you also an heir 
Romans 8:17  Now if we are children, then we are heirs--heirs of God and co-heirs with Christ, if indeed we share in his sufferings in order that we may also share in his glory.

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. 
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