But Jesus said, "They need not go away; you give them something to eat."
Matthew 14:16

The evangelist must be prepared to disciple. It's not enough to just speak the truth and walk away or to hold an altar call and then lock people into lifelong Sunday School. Those who hear the call and are prompted to "hunger and thirst for righteousness" must then be fed by instruction, example, and leadership so that they too can become teachers, elders, prophets, and evangelists.