C.H. Spurgeon addresses the alarming trend of progressive theology, which he views as a dangerous deviation from the true gospel. He critiques those who openly embrace heretical beliefs, suggesting that many have long harbored these errors before publicly declaring them. Spurgeon emphasizes the importance of maintaining the integrity of the gospel, warning against the notion that it can be improved or altered by human wisdom. He calls for vigilance against the infiltration of false doctrines within the church and encourages believers to stand firm in their faith, even amidst widespread apostasy. Ultimately, he reassures the faithful that the battle against error is ongoing, but with God's help, truth will prevail.