Just as a candle or lamp is not to be hid, but rather displayed so that everyone can benefit from its light, so a Christian must let his light so shine before men that they might see his good works and glorify his Father which is in heaven. We are to go and bring forth fruit (John 15:16). The great commission of the Church is to reach the world.

The early Christians experienced the love of Christ in an personal and life-transforming way. This moved them to reach their known world with the Gospel of Christ more than any other generation of Christians has since. They didn't have the benefits of our modern technology, but they did have the benefit of being full of the love of Christ. Experiencing the love of Christ causes us to be filled with the fullness of God (Ephesians  3:19) and makes us a witness to the world (John 13:35).

Much of the emphasis of the Church is placed on techniques of evangelism or spiritual warfare. People are moved to witness through feelings of guilt or punishment if they don't. Much of our evangelism has become as dead and non-productive as the efforts of the cults whose people knock on doors and argue others into their way of thinking. 

The Church needs a revival of our personal relationship with the Lord. When we can truly say like Paul that the love of Christ constrains us, then we will impact our world for the Lord, too. We can't give away what we don't possess. We need to personally know the love of Christ in an experiential way before we try to share it with others. We need to let Him love us, and let His love flow through us to others. The world is hungry for love, real love.