After an age of original integrity, the doctrine of divine simplicity fell from grace. Once a cornerstone of orthodox Christianity's doctrine of God, many modern theologians expelled it from the garden for the sin of employing pass� Platonic and Aristotelian metaphysics. But was the doctrine of divine simplicity's fall deserved? Is it unreasonable to hold that God is metaphysically without parts? Is the Lord really one? Rather than dismiss the challenges leveled against divine simplicity, The Lord is One engages them, presenting exegetical, historical, and theological treatments of divine simplicity. This volume argues that the doctrine of divine simplicity is cogent and indispensable while also making space for historically marginalized or idiosyncratic articulations of it. After all, once expelled from paradise, nothing returns exactly as it was.