John 9 gives us the story of the witness of the healed blind man. It teaches us about witnessing, and it contains some great Bible quotes. In verses 6, Christ healed a man who had been blind since birth. Then the people asked him how he received his sight, and in verse 11, he simply replied honestly, “The man they call Jesus made some mud and put it on my eyes. He told me to go to Siloam and wash. So I went and washed, and then I could see.”
They asked where Jesus had gone, and he again just replied honestly, “I don’t know.”
Then they brought the man to the Pharisees who also asked him how he had received, and again his reply was simple and honest: “He put mud on my eyes and I washed, and now I see.”
Verse 24 says, “A second time they summoned the man who had been blind. ‘Give glory to God by telling the truth,’ they said. ‘We know this man is a sinner.'” The man replied, “Whether he is a sinner or not, I don’t know. One thing I do know. I was blind but now I see!”
He didn’t try to judge anyone, or add any opinions or conjectures. He just told what he knew.
When they asked him a third time in verse 27, he did get a little bit sarcastic, but still honestly: “I have told you already and you did not listen. Why do you want to hear it again? Do you want to become his disciples too?”
Verse 28 says, “Then they hurled insults at him and said, ‘You are this fellow’s disciple! We are disciples of Moses! We know that God spoke to Moses, but as for this fellow, we don’t even know where he comes from.’
The man answered, ‘Now that is remarkable! You don’t know where he comes from, yet he opened my eyes.'”
Then they threw the man out, but Jesus found him and asked him in verse 35, “Do you believe in the Son of Man?”
The man asked, “Who is he, sir? Tell me so that I may believe in him.”
Jesus said, “You have now seen him; in fact, he is the one speaking with you.”
Then in verse 38, the man said, “’Lord, I believe,’ and he worshiped him.”
Verse 39-41: “Jesus said, ‘For judgment I have come into this world, so that the blind will see and those who see will become blind.’ Some Pharisees who were with him heard him say this and asked, ‘What? Are we blind too?’ Jesus said, ‘If you were blind, you would not be guilty of sin; but now that you claim you can see, your guilt remains.'”
This is all it means to be a witness of Christ: Just tell what you know about him, plainly and honestly. God the Holy Spirit will take it from there.