Testimony of John Invaluable.--[1 John 1:1-3 quoted.] Thus John bears testimony that he had seen Christ, had been with Christ. In the early history of the Christian church, the enemy tried to bring in questions that would lead to doubt and dissension. At this time the testimony of John was invaluable in establishing the faith of the believers. He could say with assurance, I know that Christ lived on this earth; and I can bear testimony regarding His words and works (Manuscript 29, 1911).

 The apostle John is an example of the way in which God can use aged workers. Read his stirring words, written when he was an old man. Who could bear a firmer, more decided testimony? [1 John 1:1-10; 2:1-5 quoted.]
 In his old age John revealed the life of Christ in his life. He lived to be nearly one hundred years old, and over and over again he repeated the story of the crucified and risen Saviour. Persecution came upon the believers, and those young in experience were often in danger of losing their hold on Christ. But the old, tried servant of Jesus steadfastly maintained his faith (Manuscript 92, 1903).