Jerome of Stridon
The same lazy individual is depicted here as in Proverbs. He rests his hands upon his chest, and suddenly poverty arrives like a swift messenger; from overwhelming hunger, he consumes his own flesh. He believes it preferable to have a single handful of flour and remain idle than to work hard and enjoy abundance. This scenario illustrates that those who toil and possess anything in this world attract envy, while those who choose to live without effort are burdened by destitution. Both states bring misery: one is plagued by the pressures of wealth, while the other suffers from the lack inflicted by poverty. Indeed, it is a profound truth. The individual who harbors envy towards another's joy, who internally wrestles with this sentiment, devours his own spirit and vitality.
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The more he observes the happiness of the one he envies, the more he himself diminishes and fades away, consumed by jealousy. Furthermore, the term ‘hands’ often signifies deeds, as in 'the word of the Lord came by the hand of Haggai' or that of other prophets, since they performed acts that made them worthy to receive God’s word. This resonates with David’s declaration about ‘teaching my hands for combat.’ Thus, the foolish man folding his hands signifies his refusal to engage in labor; he shuns reaching out to work, leading him to consume not the fruits of his labor—which he lacks—but rather to live according to the fleeting wisdom of the flesh, meagerly nurturing his own needs.