The Book of Acts records the beginning of the church for which Jesus died on the cross. The key verse of the book of Acts is probably 1:8, But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in Judea and Samaria and to the ends of the earth. The term witnesses here refer specifically to the men Jesus had designated to be His apostles. However, we are all witnesses in the general since of the mighty love of God and His saving grace.
A Chinese farmer, after having cataracts removed from his eyes made his way from the Christian compound to the far interior of China. Only a few days elapsed, however, before the missionary doctor looked out his bamboo window and noticed the formerly blind man holding the front end of a long rope. In a single file and holding a long rope behind came several blind Chinese whom the farmer had told about his operation. They all knew the farmer had been blind, but now could see. He told them of the doctor who had cured him; naturally all these other blind people wanted to meet his doctor. The cured man could not explain the mechanics of the operation, but what he could do is tell the others that he was blind and now could see. We do not need to understand it all to be a Christian witness.