Cyrill of Alexandria
Finally, the voice of the prophet is distinctly present in this declaration. We might observe that these expressions reflect the sentiments of those who are justified through faith, who take joy in Christ and acknowledge Him as the source of their strength, asserting that through Him all things are achievable, as the Apostle Paul articulates: “I can do all things through Jesus Christ who strengthens me” (Phil. 4:13). Additionally, the beloved David affirms this when he proclaims: “as the praise of their strength thou art” (Ps. 88:18). From Him alone, they anticipate being enriched with steadfastness in righteousness; for the phrase "and He shall teach my feet to be done" conveys the essence of this belief.
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The Hebrew text replaces "fulfilment" with "steadfastness," emphasizing the need for consistency. The steadfast feet clearly point to perseverance in righteousness, reliability in virtue, fidelity in faith, and love for Christ. It is evident that the lives of those who are justified in Christ are not rooted in worldly or base matters but rise above all earthly concerns, reflecting the highest attributes, as indicated by the assertion, "unto the high He lifteth me up." Indeed, the virtues associated with the gospel life are held in high esteem by God. Furthermore, He assures us that we shall triumph over our enemies and prevail against our foes by offering Him praise, as He affirms: "I will overcome in my song."