We are baptized into (not merely in) the Name of the Father, the Son and the Holy Spirit. When faith grasps the significance of baptism it dawns on us that we have been given the privilege of all privileges – fellowship with God. We are His, and He is ours – forever! His grace does not cleanse us from sin simply for its own sake, but to fit us for His company throughout the whole of our lives. So baptism announces to us the overwhelmingly great privilege of fellowship with the triune covenant-making and covenant-keeping God. And because baptism symbolizes this, it calls us to a new life-style marked by ongoing repentance and faith.
Sinclair Ferguson