Matthew 9: 35 - 38
35 And Jesus went about all the cities and villages, teaching in their synagogues and preaching the gospel of the kingdom, and healing every disease and every infirmity.
36 When he saw the crowds, he had compassion for them, because they were harassed and helpless, like sheep without a shepherd.
37 Then he said to his disciples, "The harvest is plentiful, but the laborers are few;
38 pray therefore the Lord of the harvest to send out laborers into his harvest."

EWTN