The sermon exhorts believers to guard the objective deposit of apostolic gospel truth against false teachings and profane novelties. It outlines five practical methods for preserving this faith: avoiding irreverent babble, rebuking false teachers, preaching sound doctrine, passing the truth to faithful men, and remembering those who have swerved from it. The message emphasizes that the church serves as the pillar and buttress of truth, tasked with maintaining the unchanging revelation delivered once for all. Ultimately, the preservation of truth relies on the gracious power of the Holy Spirit to keep believers steadfast in their confession. Guard The Deposit of Truth Guard The Deposit of Truth: Part 3