We frequently mention the testimony of God, but what exactly is His testimony and what does this testimony mean to us? The testimony is the self revelation of God. In other words, it represents God's heart desire, which is also God's requirement; or we may say, God's standard. His standard reveals himself, showing us what a God He is. When this testimony comes to man, it becomes law. On God's side, it is testimony, but on the human side, it is law. The Lord Jesus comes to bear witness to the Father; the Holy Spirit comes to bear witness to Christ; the church is to maintain the testimony of Jesus Christ in the power of the Holy Spirit. The witnessing of Christ is none other than telling people who Christ is and what Christ is. It behooves us not to sin against this testimony; for whenever we do sin against it, our action will not easily be overlooked by God. In this volume Watchman Nee presents in the first part the testimony of God as to what it is, how it comes to us, and what our responsibility is towards it. In the second part, he exhorts us to be faithful to the testimony which is committed to us and to finish our course triumphantly. May such faithfulness to the very end be the case in the lives of all who read the pages of this book.