"And this is eternal life, that they know you, the only true God, and Jesus Christ whom you have sent." —John 17:3 In Your Light We See Light: A Reformed Theology of Divine Illumination argues that the doctrine of illumination is Trinitarian and participatory. We cannot know God apart from God. The Triune God transfers us from darkness to light, so we may see him, ourselves, and the world anew. Illumination is not merely cognitive; it turns a heart of stone into a heart of flesh. It involves life with God—hearing and being transformed by God's word. Paul C. Uyen begins with Scripture before retrieving the doctrine of illumination from Orthodox, Roman Catholic, and Reformed traditions, and revealing their areas of tension. Uyen articulates a Reformed perspective in conversation with other traditions.