"The Harvest truly is plenteous, but the labourers are few"
Many read this and take it upon themselves to be the labourers. They imagine that the purpose of the verse is to promote the desire to serve in their hearts.
Therefore it is safe to say there is a need of acknowledging truly called men of God on top of prayer, for true laborers are sent forth by the Lord of the harvest. And the self-appointed labourers need to be treated as intruders.