John Wesley preaches on the necessity of uniting against wickedness and the importance of the Church's role in opposing the works of darkness. He emphasizes that true members of the Church should actively engage in reforming society and combating sin, rather than indulging in it. Wesley recounts the historical efforts of the Society for Reformation of Manners, which successfully addressed various societal vices, and calls for renewed commitment to this cause. He stresses that those who wish to engage in such reform must possess faith, courage, and love, and act with humility and sincerity. Ultimately, Wesley urges all believers to rise up and contribute to the fight against ungodliness for the glory of God and the good of humanity.