In this collection of articles, we present an outline of Trinitarian theology. It begins with Jesus Christ. As God in the flesh, he reveals to us what God is; he teaches us that the Father is in character just like Jesus.Other doctrines flow from that point. Jesus reveals that there was, even before time began, love between the Father and the Son. There are relationships within God, yet there is only one God. Humanity was made in the image of God, and we are made for the purpose of having eternal relationships, based on God's love, with him and with one another. Yet we fall short of this divine purpose; we are unable to qualify ourselves for the kingdom of God. This brings us back to Jesus, the incarnate God. As our Creator, he could represent us all, and so he became human as our representative and substitute, to atone for the sins of all humanity and to reconcile all humanity to God. He extends unconditional love and grace to us. Humans, however, do not always return that favor, and so there is a growth process toward the goal God has established for us. It is tremendously good news, and the more we learn about the God revealed in Jesus Christ, the more that we desire a relationship with him. We have not earned his love, but he has earned ours.It is all built upon the unity of the Father and of Jesus. And yet the Bible says that there is only one God. How can we have plurality within one Being? The doctrine of the Trinity was formulated to say how Father and Son are one God: two Persons in one God. As we discuss in another book, the Holy Spirit is likewise a Person in the Triune God. God is love, and we are invited to join him for eternity!