The Christian life is a life of relationship. We fellowship with one another, but we also, importantly, fellowship with the triune God. When we confess that we believe in the Holy Spirit, we confess that we believe not in an idea but in one of the persons of God. God gives of his very self. Many Puritan writers would compare the gift of the Spirit to the light and warmth of the sun: “As the sun gives of itself—its own light and warmth—in shining on us, so God gives us himself and the blessedness he has always enjoyed. He does so in giving us his Son, and he does so in giving us his Spirit” (Michael Reeves, “The Christian Life: The Spirit gives Himself,” Delighting in the Trinity: An Introduction to the Christian Faith, [Downer’s Grove, IL: IVP Academic, 2012], Kindle).