Whenever the question of “how” is raised in the early Christian writings, the answer comes back: by the Spirit. The Spirit who brooded over the waters of chaos, the Spirit who indwelt Jesus so richly that it became known as the Spirit of Jesus: this Spirit, already present within Jesus’s followers as the firstfruits, the down payment, the guarantee of what is to come, is not only the beginning of the future life, even in the present time, but also the energizing power through which the final transformation will take place.