Sermons: Must Be Full of Christ. “I have had to interline your sermon all through and through with the name of Christ,” was the criticism which an aged parishioner once passed upon the discourse of a young pastor. Said the lamented M’Cheyne, “Some speculate on doctrines about the gospel, rather than preach the gospel itself.” “I See a man cannot be a faithful minister, until he preaches Christ for Christ’s sake.”: Christian Treasury.