2 Timothy 2:6

The hardworking farmer. Not careless: but one who works. For indeed, the teacher who also works with the students will receive rewards from God for the benefit and advantage of the students. — [GREGORY OF NYSSA]1 As teachers must first be perfected in themselves in what they teach. For this is necessary, to partake first of the fruits, which they cultivate in themselves through virtues before others. [end of the excerpt by Gregory of Nyssa] — The example of the soldier and the wanderer suits the students, but that of the farmer suits only the teachers. For just as, it is said, the farmer takes care of the land and the fruits, so must you take care of the students and your preaching. And see to the return. The benefit, it is said, of the students is first enjoyed by the teacher from God, just as the farmer enjoys the fruits.

"The husbandman that laboreth must be first partaker of the fruits." He had first spoken from his own example as a teacher. He now speaks from those that are more common, as wrestlers and soldiers, and in their case he sets before him the rewards. First, that he may please him who hath chosen him to be a soldier; secondly, that he may be crowned; now he proposes a third example that more particularly suits himself. For the instance of the soldier and the wrestler corresponds to those who are under rule, but that of the husbandman to the Teacher. (Strive) not as a soldier or a wrestler only, but as a husbandman too. The husbandman takes care not of himself alone, but of the fruits of the earth. That is, no little reward of his labors is enjoyed by the husbandman. Here he both shows, that to God nothing is wanting, and that there is a reward for Teaching, which he shows by a common instance. As the husbandman, he says, does not labor without profit, but enjoys before others the fruits of his own toils, so is it fit that the teacher should do: either he means this, or he is speaking of the honor to be paid to teachers, but this is less consistent. For why does he not say the husbandman simply, but him "that laboreth"? not only that worketh, but that is worn with toil? And here with reference to the delay of reward, that no one may be impatient, he says, thou reapest the fruit already, or there is a reward in the labor itself. When therefore he has set before him the examples of soldiers, of wrestlers, and husbandmen, and all figuratively, "No one," he says, "is crowned except he strive lawfully." And having observed that "the husbandman who laboreth must first be partaker of the fruits," ...