Take from me, O Lord, my heart of stone. Take away my hardened heart. Take away my uncircumcised heart. Give me a new heart, a heart of flesh, a pure heart! You who purify the heart, you who love the pure heart, possess my heart and dwell within it, enclosing it and filling it, higher than what in me is highest, more inward than my most inward part. O form of beauty and seal of sanctity, seal my heart in your image, seal my heart under your mercy, O God of my heart, O God my portion forever. Amen.”
Baldwin of Forde, Spiritual Tractates, Vol. Two: Tractate X/I “On the Seal of the Love of God” (CF 41, p. 83)