Jesus Christ calls Himself "the Amen, the Faithful and True Witness. . . ." We say, "Amen," at the end of a prayer. What is "amen"? It affirms that the prayer is true and one agrees with it. Here Jesus is the Amen. Descriptive terms follow it to help us understand—He is a "Faithful and True Witness." Christ is the faithful and true witness of God—His example is an exact representation of what God would be like if He were a man. Already, He is contrasting Himself with the Laodicean and what He finds so distasteful. They are faithless in carrying out their responsibilities to Christ. They are lukewarm—good for nothing but vomiting.
We have been called to be witnesses. Through the prophet Isaiah, God says, "[Y]ou are My witnesses . . . that I am God" (Isaiah 43:12). He has made witnessing our responsibility. We witness with our lives, but the Laodicean fails miserably as a witness because he is so worldly. The only witness Christ gets out of him is that he is worldly, which is spiritually useless.
The illustration described here is as if the Laodiceans were on trial and Christ, the Faithful and True Witness, is testifying against them. As the Source of all creation, He is not fooled by their diplomacy and compromise: He sees their witness is unfaithful and untrue. In fact, the word Laodicea means "judgment of the people," and the entire letter is a study in contrasting judgments, the Laodicean's and God's. The physical man looks at his material and social circumstances and evaluates himself as spiritually sound. On the other hand, the spiritual God looks at the same person and sees spiritual poverty.