There is in God, some say,
A deep but dazzling darkness.

Henry Vaughan (1621–1695), the Welsh “metaphysical” poet, wrote this line in the mid-17th century amid the religious and political upheavals of the English Civil War and Interregnum. After an early secular phase, Vaughan underwent a marked devotional turn, influenced by Anglican spirituality and by earlier mystical writers. The phrase “dazzling darkness” belongs to a long apophatic (negative-theology) tradition—associated especially with Pseudo-Dionysius—describing God as ultimately beyond human comprehension: encountered not as clear conceptual knowledge but as an overwhelming, blinding presence. Vaughan’s poetry often dramatizes this tension between longing for divine intimacy and the limits of human sight and language.

The couplet compresses a paradox central to mystical theology: God is “deep” (infinite, unfathomable) and “dazzling” (radiant, self-revealing), yet experienced as “darkness” because the divine exceeds the mind’s capacity to grasp. The “darkness” is not evil or absence but the effect of excess light—like being blinded by brilliance. By attributing the claim to “some say,” Vaughan gestures to a received tradition rather than a private invention, aligning his devotional poetry with learned mystical discourse. The line thus suggests that true knowledge of God involves humility, reverent unknowing, and awe before mystery rather than tidy rational certainty.