Harry Ironside emphasizes the necessity of city-wide repentance, illustrating that while repentance is an individual act, cities are also accountable to God. He references biblical examples, such as Nineveh's repentance and Jesus' lament over Jerusalem, to highlight the importance of preachers addressing civic sins and calling communities to turn back to God. Ironside argues that true change in society comes from the faithful preaching of the Gospel, which leads to individual transformation and, consequently, communal revival. He calls for ministers to boldly confront societal evils and to return to the foundational truths of Scripture and prayer, urging a collective return to God for the sake of cities lost in sin.