Adam Clarke

The husbandman that laboureth - That is: The husbandman must first till his ground before he can expect a crop; and he must till it according to the proper rules of agriculture, else he cannot have a crop. The combatant must fight and conquer, and fight according to the laws of the agones, before he can be crowned; so the Christian minister must labor in the spiritual vineyard, and labor too under the eye and according to the direction of his Master, before he can expect that crown of righteousness that fadeth not away.