The vineyard belongs to God, and so does the harvest. Every Christian ought to be concerned with sowing, but the harvest is the reason we labor.
Harvest is great.
Paul and others would enter a city and leave after starting the Lord's church. Someone would be left to further teach and strengthen the new Christians while the rest of the group would move on to repeat the process of teaching, baptizing, and teaching. It is the greatest work known to man to be involved in this great harvest. We have to face that the harvest has slowed down in recent years. We experienced great growth for a period of some twenty years.