Let us consider four portions of the Word. They are good examples of witnessing.
In John 4 the Lord told the Samaritan woman about the living water. By this she realized that no one on earth can find satisfaction without the living water. Everyone who drinks of the water from the well will thirst again. No matter how many times man drinks of that water, he will thirst again; he is never satisfied. Only by drinking the Lord’s water will we not thirst again, because there is a spring that will flow out of us and satisfy us continuously. Only this inner satisfaction can give us true satisfaction. The Samaritan woman had been married five times. She married one man after another; she had changed her husband five times, yet she was still not satisfied. She was a person who drank again and again but was never satisfied. Even the man who was with her at that time was not her husband. She, undoubtedly, was not a satisfied person. But the Lord had the living water that could satisfy her. When the Lord showed her who He was, and when she had Him, she left her waterpot and went away into the city, saying, "Come, see a man who told me all that I have done. Is this not the Christ?" (v. 29). Her first reaction was to testify to others. What did she testify? She testified Christ. Perhaps the people in the city knew something about her, but there were probably many things which they did not know. Yet the Lord told her everything. She testified to others, saying, "Is this not the Christ?" The moment she saw the Lord, she opened her mouth to invite others to find out whether He was the Christ. As a result of the woman’s word, many believed in the Lord.
Every Christian has an obligation to be a witness and to introduce the Lord to others. The Lord has saved a great sinner such as me. If He is not the Christ, who else can He be? If He is not the Son of God, who else can He be? I have no choice but to open my mouth. I have to open my mouth to testify. Although I may not know how to give a message, at least I know that He is Christ. I know He is the Son of God, the God-appointed Savior. I have seen that I am a sinner, and I know that the Lord has saved me. I cannot explain what has happened to me, but I can ask others to come and see what a great change has occurred in me. I do not know how it came about. Formerly, I considered myself a good man. Now I see myself as a sinner. The Lord has shown me my sins, things which I did not realize were sins. Now I know the kind of person I am. I committed many sins in the past which others did not know about and which even I myself may not have known about. I committed many sins, yet I did not realize that they were sins. Here is a man who told me everything I have done. He told me what I already knew, and He also told me what I did not know. I can only confess that I have touched Christ and have met the Savior. Here is a man who told me that the "husband" I had was not my husband. He told me that if I drank of this water, I would thirst again and come back for more. How true were those words! Come and see. Is He not the Savior? Is He not the Christ? Is He not the only One who can save us?
All those who have seen that they are sinners surely have a testimony to give. Those who have seen the Savior also have a testimony to give. This woman gave her testimony within a few hours after she had met the Lord. It was something that happened on the same day, not something that happened a few years later when she returned from a revival meeting. She witnessed to others immediately after she returned to the city. Once a person is saved, he should tell others what he has seen and understood immediately. Do not speak what you do not know, and do not give a long discourse. Just tell them what you know. This is all you need to testify; you only have to tell others how you feel. Some can say, "I was so depressed before I believed in the Lord. But now that I have believed in the Lord, I have become so happy. In the past I pursued many things but was never satisfied. Now there is an unspeakable sweetness within. Before I believed in the Lord I could not sleep at night. But now I can sleep well. I used to be full of anxiety and bitterness. But now I feel peace and joy wherever I go." You can tell others what you have experienced. You do not need to tell them what you cannot say. You do not need to tell them what you do not know. Do not speak anything beyond what you know or beyond your present situation. That may stir up arguments. Present yourself to others as a living witness. They will have nothing to say.
(New Believers Series: Witnessing #4, Chapter 1, by Watchman Nee)