From Robert E. Coleman’s The Master Plan of Evangelism:

Evangelism is not an optional accessory to our life. It is the heartbeat of all that we are called to be and do. It is the commission of the church that gives meaning to all else that is undertaken in the name of Christ. With this purpose clearly in focus, everything that is done and said has glorious fulfillment of God’s redemptive purpose—educational institutions, social programs, hospitals, church meetings of any kind—everything done in the name of Christ has its justification in fulfilling this mission.