1 Corinthians 9:7

When he teaches that every man ought to live of his own industry, he begins with a copious induction of examples-of soldiers, and shepherds, and husbandmen. But he wanted divine authority.

The church has its own soldiers and its own provincial officers … its vineyard and its planters, its flock and its shepherds.… Thus some are rightly fed and clothed at the expense of the charitable rich. They accept nothing for their own necessities except from those who sell their goods. They are not to be judged and condemned by the more perfect members of Christ who furnish their own needs with their own hands—a higher virtue which the apostle strongly commends. They in turn ought not to condemn as Christians of lower grade those from whose resources they are supplied.… The servants of God who live by selling the honest works of their own hands could, with much less impropriety, condemn those from whom they receive nothing than could those others who are unable to work with their hands because of some bodily weakness yet who condemn the very ones at whose expense they live.

"What soldier ever serveth at his own charges?" For since, which was the strongest point, he had proved from the Apostles that it is lawful to do so, he next comes to examples and to the common practice; as he uses to do: "What soldier serveth at his own charges?" saith he. But do thou consider, I pray, how very suitable are the examples to his proposed subject, and how he mentions first that which is accompanied with danger; viz. soldiership and arms and wars. For such a kind of thing was the Apostolate, nay rather much more hazardous than these. For not with men alone was their warfare, but with demons also, and against the prince of those beings was their battle array. What he saith therefore is this: "Not even do heathen governors, cruel and unjust as they are, require their soldiers to endure service and peril and live on their own means. How then could Christ ever have required this?" Nor is he satisfied with one example. For to him who is rather simple and dull, this also is wont to come as a great refreshment, viz. their seeing the common custom also going along with the laws of God. Wherefore he proceeds to another topic also and says, "Who planteth a vineyard, and eateth not of the fruit thereof?" For as by the former he indicated his dangers, so by this his labor and abundant travail and care. He adds likewise a third example, saying, "Who feedeth a flock, and eateth not of the milk thereof?" He is exhibiting the great concern which it becomes a teacher to show for those who are under his rule. For, in fact, the Apostles were both soldiers and husbandmen and shepherds, not of the earth nor of irrational animals, nor in such wars as are perceptible by sense; but of reasonable souls and in battle array with the demons. It also must be remarked how every where he preserves moderation, seeking the useful only, not the extraordinary. For he said not, "What soldier serveth and is not enriched?" but, "What soldier ever serveth at his own charges?" Neither did he say, "Who planteth a vineyard, and gathereth not gold, or spareth to collect the whole fruit?" but, "Who eateth not of the fruit thereof?" Neither did he say, "Who feedeth a flock, and maketh not merchandize of the lambs?" But what? "And eateth not of the milk thereof?" Not of the lambs, but of the milk; signifying, that a little relief should be enough for the teacher, even his necessary food…