John Climacus, Scal. 14, as quoted by Inbar Graiver, Asceticism of the mind, Studies and texts 213 (Toronto: Pontifical Institute of Medieval Studies, 2018), 45n69, who is clearly quoting the Classics of Western spirituality translation by Luibheid & Russell, p. 169. Greek: PG 88, col. 869A. (I have not yet examined any of this closely.) Trans. Moore, St. John Climacus, The ladder of divine ascent 14.28 (New York: Harper & Brothers, [1959]), 144:
It is amazing to see the bodiless mind defiled and darkened by the body, and likewise the immaterial spirit purified and refined through clay.