Now when all the people were baptized, and when Jesus also had been baptized and was praying, the heaven was opened, and the Holy Spirit descended upon him in bodily form, as a dove, and a voice came from heaven, "Thou art my beloved Son; with thee I am well pleased."
Luke 3:21–22 (RSV)
St. Luke notes the truth of God in his account of Jesus' baptism. There is one God in three persons, the Holy Trinity. I will caution folk to step carefully if they wish to unpack what that means. Anyone who claims to have a simple explanation is either selling something or a heretic. Both are equally dangerous as they lead the faithful to temptations on par with what Adam and Eve knew in the Garden.
Luther made the observation that God hides Himself from us. Once we get over the shock of that statement, we have to concede that Luther is right. What do we truly know of God? My mind goes into neutral, trying to grasp that God has no beginning. God has always been. I can understand God having no end, but to have always been?
The Holy Trinity is a profound mystery. We confess it to be true. The Apostles, Nicene, and Athanasian Creeds all bear witness to this reality. The Athanasian Creed aids us in acknowledging that we cannot understand the Holy Trinity. We believe it, for it is the truth of God.
Though the fullness of God is hidden from us, we see in Jesus the love of God made flesh alive among us. We need not comprehend God in His full nature. We know the divine love and mercy embodied in Jesus, revealed for our redemption and salvation.
Thanks be to God that we need not fully grasp the divine nature. We trust that the love within the Holy Trinity has come among us in the person of Jesus.