John Chrysostom
One may especially marvel at Paul's wisdom. Just as he drew his exhortations from both the spiritual and the bodily, so when speaking of recompense he does the same thing. That is, he points to two kinds of recompense, spiritual and bodily.
Thus the words, "He has scattered, he has given to the poor; his righteousness remains forever," point to spiritual recompense. The words, "He will supply abundance to what you have sown," point to bodily recompense.
Yet he does not stop there, but again passes to spiritual recompenses. He always sets them one beside the other in alternation. Namely, the words, "He will multiply the fruits of your righteousness," mean spiritual recompense.
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He does this and varies his discourse in order to uproot fearful and fainthearted thoughts in them. By various means, and by pointing to the present example, he dispels their fear of poverty.
Indeed, if God gives to those who sow the earth, and if He gives abundantly to those who feed their body, then much more does He give to those who cultivate heaven and care for their soul. It is pleasing to Him that such cares be under His special providence.
But the Apostle sets this forth not as a syllogism, and not in the way I have said it, but in the form of a prayer. At the same time he makes his reasoning clear. He raises them to greater hope, not only by pointing to daily examples, but also by this very prayer.
"He will supply," he says, "abundance to what you have sown and multiply the fruits of your righteousness." Here again he quietly teaches generosity, as the words "He will supply abundance and multiply the fruits of your righteousness" make clear.
At the same time, by the words "and bread for food," he does not allow them to desire anything beyond what is necessary to sustain life. This is especially admirable in Paul.
As before, when speaking about what is necessary for life, he does not allow anyone to seek anything beyond need. But when speaking about spiritual goods, he counsels that they be gathered in great abundance.
Therefore he said above, "having all sufficiency in all things, you may be rich in every good work" (v. 8). And here he says, "He who gives bread for food will supply abundance to what you have sown," that is, to the spiritual sowing.
Since he requires not simply almsgiving, but generous almsgiving, he constantly calls it seed. Just as seed cast into the earth brings forth a rich harvest, so almsgiving brings full sheaves of righteousness and produces countless fruits.