John Chrysostom
Here is a fourth proof that support must be provided for teachers. After saying, "What soldier ever serves at his own expense?" and, "Who plants a vineyard?" and, "Who tends a flock?" and after pointing to the ox that treads out the grain, he brings forward a new and most substantial reason why they have the right to receive. It is that they not only labor, but themselves give the disciples things far greater.
What then does this mean: "If we have sown spiritual things among you, is it a great thing if we reap your material things?" (1 Cor 9:11). Do you see a reason more just and more substantial than the preceding ones? There, he says, the seeds are material and the fruit is material. Here it is not so. The seed is spiritual, but the recompense is material.
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So that those who provide something for teachers may not think highly of themselves, he shows that they receive more than they give. Farmers reap what they sow. But we sow spiritual things in your souls and reap material things, because such is the food provided to us.