Surrendering to intense negative emotions, such as anger and jealousy, is a hallmark of the foolish and ultimately paves the way to their own destruction. In a sharp rebuke directed at Job, a profound warning is issued regarding the devastating consequences of resenting how God manages the world.
There are different ways this foolishness manifests. One type of person acts recklessly without thought or planning. When he inevitably fails to achieve his goals, he lives in a constant state of anger directed at God [רלב״ג]. Another perspective views this fool as someone who makes do with mere faith and divine providence rather than taking proper action [מלבי״ם]. A second type of person is easily tempted, drawn away by his own desires and the illusion of success [מצודת ציון, רלב״ג, שטיינזלץ]. These two personas are deeply connected. The intense passions of the easily tempted person drive him to act rashly without the proper tools, effectively transforming him into the reckless fool who fails and grows bitter [רלב״ג].
These individuals are consumed by dark emotions. While some understand their jealousy specifically as an envy of the success and tranquility enjoyed by the wicked [מצודת דוד, מלבי״ם, אלשיך], others view this jealousy simply as another form of deep-seated anger and rage [רש״י, רמב״ן]. This leads to a piercing critique of Job's reaction to his suffering. When a person responds to hardship with anger instead of remaining silent and waiting for God's mercy, he alienates any advocates who might speak in his defense [רש״י, מצודת דוד].
Crucially, the ruin that befalls such a person is not a matter of blind fate or written in the stars. Rather, it is the direct result of his own free choice to yield to anger and jealousy [מלבי״ם]. By doing so, he brings unnecessary pain and torment upon himself when his plans do not succeed [רמב״ן]. This self-destruction manifests in two distinct ways. On one hand, death can arrive as an external punishment directly from God, a consequence of the fool's anger toward Him. On the other hand, it can be a completely natural deterioration. Jealousy literally consumes the envious person from the inside out, causing his physical body to fail on its own [מלבי״ם].
A different approach views this dynamic as a critique of envying the wicked in the first place. The power the wicked hold in this world is entirely empty. In fact, even a slight expression of anger from a righteous person is enough to topple them. Therefore, a simpleton who envies the wicked is essentially destroying himself over an illusion that has no real substance at all [אלשיך].