How God interacts with humanity is not arbitrary; it operates as a direct mirror, reflecting a person's character and actions back to them. The primary approach among commentators is that the relationship between a person and God is fundamentally mutual. When an individual walks in God's ways, God rewards them and treats them in the exact same manner [מצודת דוד, רד״ק, צאינה וראינה]. For instance, when a person acts with deep kindness and willingly goes beyond the strict requirements of the law for others, God responds in kind, treating that person with grace and mercy that surpasses strict judgment [אברבנאל, אהבת יהונתן]. Similarly, when someone is completely loyal and upright, God acts toward them with perfect loyalty [ביאור שטיינזלץ]. While some explain the concept of a strong man in this context simply as a general term for any person [מצודת ציון, מנחת שי, רד״ק], others view it through a spiritual lens. In this view, it describes someone who is a warrior in the realm of deep intellectual study, yet manages to remain pure and whole in their faith [אברבנאל].
This principle of divine mirroring explains the stark contrast between the historical fates of King David and King Saul. David was known to forgive his enemies even when they were completely in his power. Furthermore, when he sinned, he immediately admitted his fault. Because of his willingness to yield and show grace, God acted kindly with Him and granted him forgiveness. Saul, on the other hand, did not naturally go beyond the letter of the law. When a prophet confronted him about his own sin, Saul attempted to deny it. As a result, God dealt with him using strict, unyielding justice, which led to a severe punishment [רלב״ג, אהבת יהונתן].
Another perspective connects these traits directly to the three Patriarchs. It was specifically because of their profound righteousness, kindness, and wholeness that God rewarded them, ensuring that His kindness would continue to protect and guide their children long after them [רש״י, רד״ק].