I John 1:1 The one who existed from the beginning is the one we have heard and seen. We saw him with our own eyes and touched him with our own hands. He is Jesus Christ, the Word of life.
The thing I get from this verse is that John is sharing from his own encounter with Jesus his faith in Him. John was one of the disciples who was with Jesus during His stay on earth. John daily walked with Jesus, talked to Him, and witnessed the things He did and taught. Jesus had a profound impact on John's life. He changed everything about John and what he understood about himself and life. John was so impacted by Jesus that he simply shared with the world what Jesus had done for him.
John, like countless others who have followed him, knew from personal experience that Jesus is God. He was very close to Jesus while He was on earth and knew deep within in his soul that Jesus is God. Once a person knows Christ from deep within his soul, he discovers that there is nothing else worth living for.
We are no different than John. We have a story to tell. We may not be led by the Spirit to put it down on paper for the world to read about it, but we can share our story. Everyone in Christ has a story to share how Christ has affected their life. There is no magic formula for being a witness for Christ. We don't have to be a Biblical whiz. We don't have to know all the steps of the Gospel message. All we need to know is what the Lord has done for us. We need to know what difference Jesus has made in our lives and share it. If we truly have been touched by the Master's hand, we cannot contain it. Our lives, words, and expressions will show it. We cannot be with Jesus without it being seen. Our witness is a natural expression of what Jesus has and is doing in our lives.
Whenever you can, just tell your story. Tell all who will listen the difference Jesus has made in you. No one can deny your personal experience if it is backed up by your life. People can argue over words and deny their truthfulness, but they cannot deny the difference Christ makes in the lives of the redeemed.