Together, they breathe forth the Holy Spirit. In John 15:26, Jesus says, "But when the Counselor comes, whom I shall send to you from the Father, even the Spirit of truth, who proceeds from the Father, he will bear witness to me." Earlier, in the first millennium, theological tradition had viewed the indwelling as fellowship. John of Damascus, who was influential in developing the doctrine of the "perichoresis", described it as a "cleaving together." Such is the fellowship in the Godhead that the Father and the Son not only embrace each other, but they also enter into each other, permeate each other, and dwell in each other. One in being, they are also always one in the intimacy of their friendship.