In this sermon, the speaker discusses the training of missionaries in China and highlights five major subjects taught to them. The first subject focuses on how to witness and live for the Lord Jesus Christ, not only through lifestyle but also in every circumstance. The speaker shares a powerful testimony of a brother who witnessed the gospel even in the face of arrest and potential execution. Despite being beaten and injured, this brother's supernatural healing and testimony led 18 criminals to receive Jesus Christ as their Lord and Savior. The sermon emphasizes the greatness of God and challenges listeners to not limit Him based on their own understanding.