Evangelism is not a duty

. . . it is a striking fact that nowhere in the letters of St Paul does the apostle lay upon the Church the duty of evanglism. The gospel is such a tremendous reality that he cannot possibly keep silent about it. 'Woe is me if I do not preach the gospel' (1 Cor 9.16). He seems to take it for granted that the same will be true for his readers. . . . Everyone must hear it. A new creation has begun. One does not have to be summoned to the 'task' of evangelism. If these things are really true, they have to be told. (Weston, Paul. ed. "Lesslie Newbigin: Missionary Theologian." Grand Rapids, MI: Eerdmans. 2006 p231)

This is why we do not need better strategies for evangelism, but true heart experience of the good news that overflows in continual public acclamation and worship. Robert Coleman relates it this way:

The careless way that many of us regard this responsibility [of evangelism] may raise the question of how sincerely we take the message to heart. When Charles Peace, the infamous criminal, was offered by the prison chaplain 'the consolations of religion' on his way to the scaffold, the wretched man turned on him and exclaimed, "Do you believe it? Do you believe it?" Then, with obvious bitterness, he cried: "If I believed that, I would crawl across England on broken glass on my hands and knees to tell men it was true."

Indeed if we really believe that Christ is God and that He died to save the world, then we cannot sit idly by while multitudes perish. Jesus is the only way whereby we can come to the Father. This message must be heard, else there is no hope for mankind. (Coleman, Robert. Songs of Heaven. Old Tappan, NJ: Fleming H. Revell Company. 1980. p65)