John Chrysostom
Thus he speaks here. In the first epistle, however, he says, "that you may walk properly." Why? Perhaps because nothing of this kind had yet occurred. Indeed, elsewhere, when exhorting, he said, "It is more blessed to give than to receive" (Acts 20:35). The words "that you may walk properly" were not spoken on account of any disorder. Therefore he also added, "that you may lack nothing" (1 Thess 4:12). Here, however, he points to another need for which one must labor: one should do what is good and useful for all. Therefore he says further, "But you, brethren, do not grow weary in doing good" (2 Thess 3:13). In general, a man who can work but remains idle necessarily becomes meddlesome.
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Alms are intended only for those who lack the strength to satisfy their needs by the labor of their hands, or for teachers who have devoted themselves wholly to the work of teaching. "You shall not muzzle an ox when it treads out the grain" (Deut 25:4), and, "the laborer is worthy of his food" (Mt 10:10). Therefore he does not remain idle at all, but receives wages for labor, and for great labor at that. To fast and pray while remaining idle is not the work of hands. Here the Apostle calls labor what one does when one works with the hands. And so that you should suppose nothing else, he added, "not working at all, but meddling."