In this lecture I express some of the insights from Christian Personalism/Realist Phenomenology about the spiritual and bodily unity that human persons are and how these insights inform John Paul II’s Theology of the body. In other words, this lecture attempts to show the mystery and beauty of the fact that human persons are spiritual and bodily. In the end I explain an argument to support the Church’s teaching forbidding contraception related to this bodily and spiritual unity of human persons and to spousal love. This lecture, the full title of which is “The Christian Personalism of John Paul II as the Foundation of Theology of the Body”, was given at the National Theology of the Body Congress in the Philadelphia area, held July 28 – 30, 2010, and is posted here with permission. Christian Personalism and Theology of the Body.