Colossians 4:3-4
At the same time, pray also for us, that God may open to us a door for the word, to declare the mystery of Christ, on account of which I am in prison— that I may make it clear, which is how I ought to speak.

Evangelism belongs, not merely to the well-being of a church, but to its very being. Evangelism is of the essence of the true church.
R.B. Kuiper