Gregory the Great
You have fixed your heart and extended your hands to Him (Job 11:13). The phrase 'guarded heart' does not imply steadfastness in virtue, but rather a state of insensitivity. Whenever a soul truly contemplates the weight of its inner struggles, it becomes softened by fear; the wave of divine reverence penetrates its being, fostering internal humility. However, the individual who has hardened their heart through stubbornness is as if they have fortified themselves, rendering them impervious to the piercing arrows of divine fear. Therefore, the Lord compassionately declares through the prophet, "I will remove your stony heart and give you a heart of flesh" (Ezekiel 36:26).
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He removes the 'heart of stone' by dissolving the rigidity brought by pride, and He imparts a 'heart of flesh' by transforming that hardness into a tender sensitivity.
The 'hand' symbolizes our actions—often, we reach out to God but then, with an arrogant sense of pride in our accomplishments, undermine the grace bestowed by the Giver. When one stands before the Eternal Judge and claims credit for their good deeds, they extend their hands to God in a spirit of arrogance. This behavior parallels those who are lost opposing the elect, as well as heretics countering the faithful; when they cannot find fault in them, they instead accuse them of performing virtuous acts out of pride, thus attributing arrogance to those whom they fail to fault for their actions. Yet, outwardly commendable deeds cannot be deemed truly good if performed from a place of prideful arrogance. Often, such self-aggrandizement prevents humble actions, and individuals may be oblivious to the self-inflicted harm this brings. Now, having previously chastised the righteous man, Sophar, as if imparting wisdom, joins in with his instruction: