Psalm 42 (41):9Meaning & Commentary from the Church Fathers

The period of the Jews was characterized by darkness and night. Yet, "in the daytime the Lord showed His mercy, but in the night He made it clear" (cf. Psalm 41:9). The night that enveloped the Jews could not diminish the light of day for Christians, who were distinct from it. Though the Jews had the authority to take away physical life, they could not obscure the light of faith.

On the day when the Lord directed His compassion and offered His song during the night, Rapsack, having besieged Jerusalem, boldly proclaimed that even God ‘could not deliver them out of the hand’ of the Assyrians (4 Kings 18:29). Nevertheless, the Lord assured, ‘I will defend this city,’ and, honoring His word, in a single night, He ‘slew one hundred and eighty-five thousand’ Assyrians (4 Sam. 19:34-35). This illustrates the meaning behind the phrase, ‘in a day the Lord shall command His mercy.’ When praying to the God of my life, one who has already come to faith expresses words befitting a believer, dedicating his very existence to God.

Recognizing the compassion that God continually bestows upon us and reflecting on it during the night, I sing praises and offer my hymns to Him who cares for us so deeply. Additionally, I present my supplications, earnestly asking that I may not be stripped of this humanity. In response, He grants us the words of the prayer.

On the day of His decree, the Lord will demonstrate His compassion. The term 'day' is employed to signify a period when clarity and brightness prevail due to the sun shining. Thus, David states that the Lord will visibly command, or in other words, will extend His favor; for one who sends also gives orders. This proclamation foretells that the liberation of the Israelites from their captivity will be evident, recognized, and unveiled to all.

In tranquility and grief, the lessons we gain in serenity are expressed through our anguish. The teachings of the Law are initially absorbed in moments of peace, yet their true effects come to light during periods of sorrow.

The word commandment reveals that David expresses a promise of future deliverance, a time that remains unclear to him. It seems as though he reasons with himself, questioning, ‘Why should I not trust in the mercy of God? Perhaps tomorrow His goodness will lead me, and by nightfall I will rest in peace with a joyful song.’ This comfort stands in stark contrast to the grief he experienced while contemplating the dreadful outcomes of God's wrath, which he referred to in the previous verse. The prayer he references at the conclusion of the verse is not one born of sorrow and despair; rather, it embodies a strong confidence that God will fill him with joy through His mercy and restore his access to Him. Thus, he addresses Him as the God of his life. From this certainty springs forth spiritual strength within us.

This Psalm was inspired by the Holy Spirit as a message from David, in which he passionately conveys his love for God, expressing a longing to behold the Lord's covenant, to which he was unable to draw near due to oppression. He prophetically encourages all the faithful to love unreservedly until the end, through Christ, the Lord God of humanity. To the sons of Korah, leaders among the singers, he instructed them to sing with intention, that they themselves, as well as those who listen, might grasp the profound truths within this psalm regarding the divine favors that Christ the Lord has bestowed upon the entire world in the fullness of time.