For ye received not the spirit of bondage again unto fear; but ye received the spirit of adoption, whereby we cry, Abba, Father.
The Spirit himself beareth witness with our spirit, that we are children of God:
Now he that wrought us for this very thing is God, who gave unto us the earnest of the Spirit.
in whom ye also, having heard the word of the truth, the gospel of your salvation,-- in whom, having also believed, ye were sealed with the Holy Spirit of promise,
which is an earnest of our inheritance, unto the redemption of (God's) own possession, unto the praise of his glory.