Charles H. Spurgeon on Psalms 19:7

"Converting the soul." The heart of man is the most free and hard of anything to work upon, and to make an impression and stamp upon this hard heart, this heart that is so stony, adamantine, "harder than the nether millstones," as the Scripture teacheth. To compel this free-will, this Domina sui actus, the queen in the soul, the empress, it cannot be without a divine power, without a hand that is omnipotent; but the ministers do this by the Word —they mollify, and wound, and break this heart, they incline, and bow, and draw this free-will whither the spirit listeth. And Clemens Alexandrinus is not afraid to say, that if the fables of Orpheus and Amphion were true —that they drew birds, beasts, and stones, with their ravishing melody —yet the harmony of the Word is greater, which translates men from Hellicon to Zion, which softens the hard heart of man obdurate against the truth, that "raises up children to Abraham of stones," that is (as he interprets), of unbelievers, which he calls stocks and stones, that put their trust in stones and stocks; which metamorphoses men that are beastlike, wild birds for their lightness and vanity, serpents for their craft and subtlety, lions for their wrath and cruelty, swine for voluptuousness and luxury, etc.; and charms them so that of wild beasts they become tame men; that makes living stones (as he did others) come of their own accord to the building of the walls of Jerusalem (as he of Thebes), to the building of a living temple to the everlasting God. This must needs be a truly persuasive charm, as he speaks. —John Stoughton's "Choice Sermons," 1640.