Augustine of Hippo
The heading of this Psalm states: In the end, you shall not be harmed. But what does it mean not to be harmed? Fulfill what You have promised. But when will this happen? At the end. This is what our focus must be directed toward before the conclusion arrives. Let us set aside everything that has happened along the journey so that we may reach the destination. While the proud may take pleasure in their momentary success, basking in accolades and adorned with wealth, their abundance is fleeting, vanishing like a shadow. When that conclusion arrives, and all who now place their hope in the Lord rejoice, then sorrow will engulf those who once held high spirits. When the humble inherit what the arrogant have scorned, the despair of the proud will transform into grief.
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Then, the voice known from the Book of Wisdom will resound: they will lament, upon witnessing the glory of the Saints—those who endured mockery in their lowliness, and who, when exalted, did not yield to pride. In that moment, they will exclaim, These are the ones we once derided. (Wisdom 5:3) They will also question, What benefit was our arrogance, and what advantage was there in boasting of wealth? All has vanished like a shadow. Because they leaned on transient things, their hopes are also fleeting, but our hope at that time will remain steadfast. In order for God's promise to remain whole, true, and unbroken for us, we have boldly proclaimed from the depths of faith, ‘In the end, you shall not face corruption.’ Therefore, do not be disheartened by the strength of any man who might undermine the promises of God. He cannot be corrupted, for He is faithful; there is no one greater who can overturn His promise. Let us place our confidence in the assurances of God and begin our song from the point where the psalm originates.