Pastor Robbey's sermon "Rebuke One Another - Final" emphasizes the importance of lovingly rebuking one another for restoration and growth. He stresses the need to deal with our sins first before correcting others, using scripture as the basis for rebuke. The purpose of rebuke is restoration, not venting frustrations, and should be done with love and gentleness. Pastor Robbey outlines different types of sins that should be rebuked, encouraging prayer, self-reflection, and reliance on God's Word in the process.