Cyrill of Alexandria
At this point, the voice of the prophet is distinctly revealed, speaking these words. Alternatively, one might interpret that the expressions of those who are justified through faith, who find delight in Christ and rejoice in Him, affirm that in Him all things are achievable for them. This aligns with the words of the Apostle Paul, who stated, ‘I can do all things through Jesus Christ who strengthens me’ (Phlp. 4:13). Likewise, the blessed psalmist expresses, ‘as the praise of their strength thou art’ (Ps. 88:18). They anticipate receiving from Him the firmness needed for godliness, as indicated by the phrase, ‘and He shall teach my feet to be done,’ which signifies no other concept.
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Therefore, the Hebrew text uses ‘steadfastness’ in place of ‘fulfilment.’ Feet equipped for steadfastness must guide us towards perseverance in godliness, stability in virtue, tenacity in faith, and love for Christ. Furthermore, the existence of those justified in Christ is devoid of anything mundane and trivial; it transcends all earthly and physical concerns and embodies the utmost virtue, as expressed in the assertion, ‘unto the high He lifteth me up.’ The virtues of a life lived in accordance with the gospel are truly esteemed in the eyes of God. And that we shall triumph over our foes and vanquish our adversaries by extolling Him is made clear by His declaration, ‘I will overcome in my song.’