I think that there are many things in the New Testament that show us that the godliness of our conversation plays an important evangelistic role. The apostles are clear that we mustn't limit the explicit sharing of the gospel to formal preaching. It can also happen in ordinary conversations.
Mark DeverI know a girl who has become a really enthusiastic Christian. I remember meeting her several years ago. She lived in a house near us. She was standing out the front smoking, not apparently interested in religious things, but she did have a respect for spiritual matters when I spoke to her. So as we talked, she expressed an interest, and began to come to church occasionally. Over the years, I have watched her come to Christ, be converted, baptized and changed in wonderful ways. It's a real joy to me when I see things like this.
Mark DeverThe important thing when you are tied down is to continue to model Christ's love. This will ensure that your words, perhaps spoken long ago, will have fresh relevance, or it will help little ones to understand what it means to live the Christian life in days to come. A life well-lived in these circumstances can be hugely useful in evangelism.
Mark Dever