St. Symeon the New Theologian ca. 949-1022
Brothers, if full knowledge of the true wisdom and knowledge of God were going to be given us through letters and formal study, what need would there be then for faith, or for divine Baptism, or even communion in the Mysteries? Obviously, none whatever. (On the Mystical Life, The Ethical Discourses. Vol. 3: Life, Times, and Theology, p. 117)