The formulating of the Trinity idea did have a little basis in truth in that the Father and Son have great unity. The Holy Spirit comes as a distinct person too. That is why the Father waited until Jesus had returned to Him (mission accomplished) before sending the Holy Spirit. Being sent by another person is a crucial indicator that someone is a distinct person. You do not SEND your own spirit to anyone. Of course it got very confused by Tertullian’s unfortunate collaboration with his gnostic opponents. Nice diplomacy for the expediency of debate outcomes, but in giving way to Gnostic and Hellenistic love of the number three and three-fold pantheons, Tertullian caused terrible risk of dividing traditional Christians and muddying the waters of doctrine. God is not the author of confusion.
