Augustine said about the doctrine of the Trinity: "In no subject is error more dangerous, or inquiry more laborious, or the discovery of truth more rewarding.” His assessment is correct; for this doctrine asks us to reconcile three paradoxical statements that the Bible teaches about God: God is three Persons, each Person is fully God, and there is only one God. The articulation of how these three biblical observations can coexist is the doctrine of the Trinity. In this lesson we will merely introduce the doctrine of the Trinity and call attention to some its more important aspects.