It is another who testifies about me. I know that the testimony which he testifies about me is true.
The second witness was the work of Jesus. His miracles were visible proof of the presence and power of the invisible God. But again the Jews did not believe (John 5:36-38). Third, there were the Old Testament Scriptures, which the Jews studied diligently, thinking that by keeping the law they would gain eternal life. Yet their studies did not lead them to accept the Saviour to whom the Scriptures pointed, and therefore they did not receive eternal life (John 5:39-40).