One of the dangers every church faces is slipping, slowly and quietly and perhaps unknowingly, into a routine where sermons are preached, songs are sung, and the Lord’s Supper is consumed, but all is done without a deep sense and awareness of the Trinity. In other words, if we are not careful our churches, in practice, can look remarkably Unitarian. And such a danger is not limited to the pews of the church. As we leave on Sunday morning and go back into the world, does the gospel we share with our coworker look decisively and explicitly Trinitarian in nature? Or when we pray in the privacy of our own home, do the three persons of the Trinity make any difference in how we petition God? In this issue of Credo Magazine, we have brought together some of the sharpest thinkers in order to bring our minds back to the beauty, glory, and majesty of our triune God—Father, Son, and Holy Spirit. But we do not merely want to see him as triune, but recognize why and how the Trinity makes all the difference in the Christian life. Therefore, in this issue Fred Sanders, Robert Letham, Michael Reeves, Scott Swain, Tim Challies, Stephen Holmes, and many others come together in order to help us think deeper thoughts about how God is one essence and three persons, and what impact the Trinity has on who we are and what we do as believers.