Jesus said to the disciples of John, "Go your way, and tell John what things you have seen and heard." (Luke 7:22)
That is all that any Gospel worker has to do. He has not to strain himself to make a learned discourse; he has not to theorize and speculate; he has only to tell what he has seen and heard. Not what he has heard men say, but what he has heard from the Lord. The command is, "Hear Him." (Mark 9:7)
Tell only what you know from personal acquaintance with Jesus. This was the source of the apostles' power. They had been with Jesus, and they said, when forbidden to teach, "We cannot but speak the things which we have seen and heard." (Acts 4:20)
You may not have heard and seen very much, but that little will be as effective as the greater amount that another has seen and heard. But do nothing to add to its effectiveness by adding something that you do not know from personal knowledge. That will weaken the whole.
The testimony of the man in court, who knows only one thing about the case, and who sticks to that one thing, is as useful as any man's testimony could be. But he throws discredit on what he does know, as soon as he begins to tell something that he does not know.
This wonderfully simplifies Christian work, and provides a place for everyone. "Go your way, tell...those things which you have seen and heard." (Luke 7:22) "Continue in those things which you have learned, and have been assured of, and knowing of whom you have learned them." (2 Timothy 3:14)--Present Truth, May 10, 1894--Timeline: IV-31 (The Inquiry by John's Disciples)--Luke 7:22.