Andrei Rublev's Faithfulness and Creativity in the Icon of the Trinity

Henri Nouwen observed that Rublev's Icon of the Trinity (1425 A.D.) would leave us in distant awe of the divine mystery if it did not so profoundly invite us into deeper intimacy with God (Behold the Beauty of the Lord: Praying with Icons, Ave Maria Press: 1987. Kindle Edition, location 143). The icon reveals something important to us about vocation, Nouwen suggests, if we look closely enough to notice the circle and the cross.