He makes the followers of Christ into one living whole, of one mind and heart, living the life of Christ as a new society to the glory and praise of the Heavenly Father. Under the seal of the Holy Spirit the society which is the Church lives the life Christ won by His death. It embodies all He lived and died for in a sense it is His body, in the same sense that the United States embodies the ideas of Washington and Lincoln. But more so, for Washington and Lincoln are dead, but Christ has risen and sent the Holy Spirit abiding with us forever. In last analysis the function of the Holy Spirit is the uniting of men with the Heavenly Father in Christ.
Definition can proceed no further.
Our union with God the Father has been made possible by the sacrifice of Christ upon the Cross for our sins. This is what we call our Redemption. Christ, Son of God, Son of Man has bought us back, paying the price of His blood. Only begotten of His Father yet born of Mary in Bethlehem. The price He paid was all He had to give, which was His life.