Thomas Brooks emphasizes that a deeper understanding of God's love leads to greater sorrow for sin, as seen in the example of Mary Magdalene, whose heart was broken by the realization of her forgiveness. He illustrates that the warmth of divine love softens the heart, prompting genuine grief for offenses against God. The more one experiences the love of Christ, the more one mourns for the dishonor done to Him, highlighting the transformative power of grace and forgiveness.