The essence of the heart remains consistent in both contexts; it is only the heart that can recover from sin, which is why it is not stated, “I will recover it with all my heart” in the earlier verse. However, one can fulfill the law externally without genuine heartfelt commitment, hence it states here, “I will keep it with all my heart.” True adherence to the law requires sincerity. Yet, since the heart can be blind, there arises a need for divine guidance so that the illuminating wisdom of reason may clarify the principles of righteousness and direct the heart towards virtuous actions. This is akin to a prophet’s prayer for understanding and illumination through the Holy Spirit, enabling diligent study of God's law, with a promise to fulfill it once understood.
Blessed Theodoret observes that while the Lord instructs us to examine the Scriptures, those who undergo this examination need enlightenment from on high, both to discover what is sought and to preserve that which has been found. Bellarmine notes that initially, the request was for favor concerning the law, but now it shifts towards a heartfelt and comprehensive knowledge of it—not out of mere curiosity, but for the purpose of safeguarding what has been learned. St. Hilary further elaborates that the foundation of wisdom is to turn to those who possess understanding when one is uncertain. Thus, the prophet first seeks wisdom for better comprehension of what is unclear, acknowledging that having received wisdom necessitates diligent inquiry, stating, “and I will test Thy law.” He includes the intention to carry out what is revealed through his research, affirming, “and I will keep it also.” Understanding that true obedience derives its power from the heart, he concludes with the commitment to “keep it also with all my heart.”
What is the prophet being called to comprehend and investigate? It pertains to the spiritual significance of all divine decrees. For instance, the six days of labor reflect the six days of creation, while the seventh day symbolizes God's rest after His creative work. Similarly, the new moon festival serves as a foreshadowing of eternal life in heaven. The prophet seeks understanding of additional elements, such as the meaning of jubilee years, circumcision, unleavened bread, Passover, and the significance of the promised land itself. He expresses a desire to grasp these meanings, vowing that once understood, he will delve even deeper into his studies and cherish the insights discovered, pledging to adhere to them wholeheartedly.
St. Ambrosius continues this theme, urging deeper exploration into what actions please God, following the interpretations of the law as given by the Lord. We are called to walk in the spiritual law, adhering to the commandments enacted by Christ, as articulated in Matthew 5: “It was spoken to the ancients... But I say unto you.” Just as there is a Holy of Holies, so too is there the ultimate commandment of commandments. When one comprehends the law in this spiritual manner, it fortifies the resolve to keep it sincerely. In contrast, the Jew may recite the law vocally without genuine comprehension or heartfelt appreciation; thus, he is rebuked: “With the mouth he honors Me, but his heart is far from Me” (Isaiah 29:13). How can someone who is distant from the Lawgiver truly keep the law?
By deeply engaging with the law and integrating its spiritual meaning into one's life, the true law-abiding individual, as expressed by St. Augustine, reaches the pinnacle of a holy and righteous existence, loving God with all his heart, soul, and mind, and his neighbor as himself; this embodies the essence of the law and the prophets. Is it not the case that many devoted believers and Christians often miss the true fruit of their labors due to a lack of understanding and an unwillingness to explore what transcends the law? Consequently, they may push against the thresholds of faith without fully entering in.
Christianity does possess an external framework, which is essential for all individuals. Still, its meaning diverges significantly from that of the Old Testament's faith tradition. In the earlier context, every detail was strictly inscribed by divine hand, where deviation—even in appearance—was considered sin. However, the Church of Christ, unlike the rigid traditions of the past, has received the living spirit of Christ Jesus, which continually manifests and evolves, adorned splendidly within the ranks of the Church. Just as this spirit of life is ever-present, the outward expression of this spirit is dynamic, unlike the stagnant nature of a mere legalistic observance.
While the law remains singular, “let all things be honorable and according to rank” (1 Cor. 14:40). In this divine order, we are nurtured and renewed by the spirit of life itself. The power lies within this spirit. Should it become dormant, and should we only adhere to the structured life of the Church, we risk becoming indistinguishable from those who follow the law without the circumcision of the heart—those who may outwardly cleanse themselves without concern for inner purity, professing devotion while pursuing self-serving ends.
Thus, a person who stands on the periphery of worship with vanity in their heart may return home believing they have performed their duty, much like one who mechanically recites prayers without true engagement of mind or spirit. Such individuals may mistakenly assume they need not seek a deeper spiritual life, only awaiting the reward of righteousness. The worthiness of good deeds arises not from mere external compliance but from the spirit in which they are performed. If we neglect this truth, we may become enslaved to the external forms of worship, perceiving them as the essence of faith: “Touch not, taste not, handle not.” This mindset fosters a form of bondage that the Lord desires to liberate believers from.