John Chrysostom
Since it is possible to bless and not curse, yet to do so without love, the Apostle wants us to be warmed by friendship. Therefore he added that we must not only bless, but also suffer and sympathize when we see that others have fallen into misfortune. You will say: well, the Apostle rightly commanded us to grieve with those who weep. But why did he give the other commandment, which contains nothing important? On the contrary, the soul needs more philosophy to rejoice with those who rejoice than to weep with those who weep. Nature itself draws us to the latter, and there is no man so stony that he would not weep at the sight of one in misfortune. But when we see a man prospering, not to envy him, and even to share his joy, requires a very noble soul.
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Therefore the Apostle placed this first. Nothing disposes us to love so much as sharing both joy and sorrow with one another. Do not estrange yourself from compassion because you stand far from the misfortune. When your neighbor suffers evil, you must regard his misfortune as common to you. Share his tears, so that you may lighten his sorrow. Share his joy, so that you may confirm his gladness, strengthen love, and receive benefit before he does. Through weeping you become merciful, and through joy you are purified from envy and ill will. See how unburdensome Paul’s commandment is. He did not say, “deliver him from distress,” lest you object that this is often impossible. He prescribed something easier, entirely within your power. If you cannot avert the misfortune, shed tears, and by this you will already drive much away. If you cannot increase his prosperity, bring your joy, and by this you will already give great relief. Therefore the Apostle commands not only that we should not envy, but, what is much greater, that we should rejoice together. This means far more than not envying.