Matthew 9:36 - 10:1 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 therefore pray earnestly to the Lord of the harvest to send out laborers into his harvest."
The calling is for shepherds - the call of the harvest is a pastoral calling - where are the shepherds?
John 4:35 35 Do you not say, 'There are yet four months, then comes the harvest'? Look, I tell you, lift up your eyes, and see that the fields are white for harvest.
The calling is not for evangelists - the Samaritan woman has sown the seeds - now He needs harvesters - pastor/teachers - to grow and collect the righteousness