Jerome of Stridon
Everything that will come to pass amounts to vanity. Do good without partiality, and maintain your acts of kindness consistently. Let the truth of the dawn be reflected in the dusk, and let the evening's generosity be revived at daybreak. The precise work that delights God remains unknown, as well as the fruits of righteousness that result from these endeavors, for it could be that both are equally acceptable in His sight. You ought to exhibit steadfastness in both youth and old age. Do not claim, "I have labored during my youth; now I deserve to rest in my later years." For you cannot ascertain whether during your youth or in your seasoned years you will bring joy to God. Moreover, refraining from sin in your youth holds no value if your old age is marked by indulgence.
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On any day that the righteous transgress, their previous good deeds cannot save them from spiritual death. If by continual good works in all stages of life you remain devoted, you shall behold God the Father—the ultimate source of light—and witness Christ, the sun of righteousness. Furthermore, even if your years are many and filled with blessings or noble deeds, keeping in mind the inevitability of death and the shadow of darkness helps cultivate a disdain for the fleeting and corruptible present. As Simmachus conveys, a person who lives a lengthy life filled with joy must also remember the days of darkness, for they will be numerous and inevitable. Conversely, Scripture assures us with the promise: "I will give you rain early and late" (Deuteronomy 11:14), which signifies the Old and New Testaments. Thus, we are encouraged to read the Old Testament without undermining the Gospels, seeking spiritual insights in the former that recognize that the evangelists and apostles convey more than mere literal interpretations. We cannot determine which covenant offers us greater wisdom and grace; blessed is the one who harmonizes the two covenants into a single entity. Such a person will behold the light and see Christ, the sun of righteousness. If he possesses deep understanding of the Scriptures over many years, he will experience supreme joy and fulfillment, continually motivated by the anticipation of eternal judgment. For the unending darkness awaits those who fail to sow diligently in both morning and evening, who do not integrate the two covenants, and thus do not perceive the light or the sun from which the light emanates.