John Owen on the church's duty of evangelism

The ordinary means of conversion is left unto the church, and its duty is to attend unto it; yea, one of the principle ends of the institution and preservation of churches is the conversion of souls, and when there are no more to be converted, there shall be no more church on the earth. To enlarge the kingdom of Christ, to diffuse the light and savour of the gospel, to be subservient unto the calling of the elect, or gathering all the sheep of Christ into his fold, are things that God designs by his churches in this world.

From John Owen, The True Nature of a Gospel Church and Its Government