John Chrysostom
Establish, O Lord, a ruler among them, so that the nations may recognize their humanity. This transition indicates a shift in tone, as noted in the different translations. Another version expresses it as continually. What does it signify to 'set a ruler over them'? It implies that they act according to their whims, unwilling to answer for their actions. You shall arise, bringing them discipline rather than coercion. Another interpreter similarly states that the fear of the Lord should be placed upon them. Notice that he does not seek punishment for their sake alone, but aims for their instruction and transformation, so they do not live without law. He desires them to be disciplined rather than merely coerced, which would also serve as an example for others.
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To illustrate the positive effects of this, he continues, saying, 'Let the nations know,' meaning that many have lost touch with their true nature, descending into madness and failing to recognize their own identities. He wisely adds 'continually,' emphasizing that self-awareness is necessary not just in moments of distress but also in times of well-being. If You should discipline them now, they will feel profound fear and remember the trials they have faced, thus understanding their nature even as they experience prosperity. Witness how the prophet intercedes for them, longing for them to abandon their folly. Truly, failing to understand oneself is a profound form of madness, far worse than mere insanity. The latter is an involuntary affliction, while the former stems from a corrupted will.