One of the main reasons that the local church is to be a community of love is so that others will know the God of love. God made people in His image to know Him. The life of the local congregation makes the audible gospel visible. And we must all have a part in that evangelism. We can all contribute to evangelism simply by building up the local church--helping to organize it or to lead it. We may teach and equip. We may provide hospitality and encouragement. We may pray and serve and show mercy and give. But we all have a responsibility to speak of God and the good news both inside and outside of the church.
~ Mark Dever, The Gospel and Personal Evangelism, pg. 51.