All three Persons of the Holy Trinity are seen here. The Son sends the Spirit into our hearts. The Spirit makes us to cry out to God the Father, calling him “Abba, ” an intimate term used by a child of his father. All that God does, he does as a Trinity.
And we pray:
O God, we do not fully understand how You can be Three and yet One. But we see this truth taught in Your Word and so accept it, not leaning on our own understanding. Our becoming Your sons by faith involved Father, Son, and Holy Spirit, and we know these Three Essence are but One God. Teach us to honor You as the great Triune God that You are. Amen.