Soak Your Hard Heart

Hard bones, soaked in vinegar and ashes, grow so soft that they can be cut with a thread. Permit me to soak your hard heart for half an hour in such a mixture! It may so soften your heart, through the work of the Holy Spirit in the Word, that you become wise unto salvation. (George Swinnock, The Fading of the Flesh and the Flourishing of Faith, 1662, Reformation Heritage Books, 2009, p. 30