In this sermon, the preacher discusses the victory of Joshua over the Amalekites and the importance of memorializing this victory. He emphasizes the wickedness of the human soul and the need for the fear of God to restrain it. The preacher then draws a parallel between Joshua's victory and the battle of Calvary, where Jesus Christ, representing Israel, faced attack as the Messiah. He warns against reducing the Christian life to mere fun and levity, and urges listeners to remember the seriousness and cost of Christ's sacrifice at Calvary.