Every Christian has a real part in the advance of the gospel. Some carry the message into new places; others welcome, support, encourage, invite, serve, and make room for that work. Gaius shows outward-facing discipleship that opens doors for the truth. Diotrephes shows how self-importance closes doors and obstructs the mission. Demetrius shows the credible life that should accompany the message. A disciple asks not only, "How am I growing?" but also, "Who am I helping move toward Christ?"