Jerome : And when you have entered, you shall remove all idols, because of which you have offended God, and I will give you a unified heart of fear and servitude to God, so that you may not serve diverse idols, or any other than what you had before. And I will give a new spirit in your midst, according to what is written: Create in me a clean heart, O God, and renew a right spirit within me (Psalms 51:12). And I will remove from you a heart of stone, that is, a hard heart, according to what Stephen, the first martyr in Christ, spoke: Stiff-necked and uncircumcised in heart (Acts 7:51). And the heart of Pharaoh was hardened, and he would not let the people of Israel go (Exod. VII). And I will give them a heart of flesh, a soft and tender heart, that they may receive the commandments of God, so that they may be written on the tablets of their carnal hearts. — COMMENTARY ON Ezekiel 3:11.17-21 Sahdona the Syrian : Truly great and mighty is the power of God's word. For the word of God has changed the "offspring of vipers" into children of God. So let us constantly sow it within the hard soil of our heart, waiting for [the word] to soften [our heart] so that the wheat ear of life may sprout up in it. For the word of God is at the same time the seed and the water; and even though we have a "heart like stone," it will be softened and split up by the water of the Spirit, so that it can bring forth holy fruit that is pleasing to God.Therefore let no one neglect meditation on the divine words or the labor of reading the appointed measure. As our honored teacher said, from such meditation the soul acquires great benefit and finds salvation. — BOOK OF PERFECTION 53-54