Human nature constantly shifts between the restless pursuit of endless desires and the quiet peace that comes from faith and contentment. A deep contrast exists between someone driven by a limitless appetite and someone who places their complete trust in God.
The primary approach among commentators is that a person with a greedy soul is consumed by desires that can never be fully satisfied. Because he struggles to fulfill his many wants, he lives in a state of constant anger and actually grows thin from endless worry. To get what he wants, he drags himself into conflicts and stirs up fights with those around him. This relentless chase destroys his relationships with other people and also awakens strict divine judgment against him [רש״י]. Ultimately, this bitterness leads him to complain about how God runs the world, as he feels that everything was created specifically to work against him [מלבי״ם].
There are other ways to understand this restless character. Some view this trait as blind pride, where a person believes he is superior to everyone else, a mindset that inevitably leads to clashes [עמנואל הרומי]. Others see it simply as a complete lack of fear of God [אבן עזרא]. Another perspective views this person as a reckless spender who throws away his wealth just to buy the affection of friends. Once his money runs out, he resorts to cheating others, and his disappointed former friends quickly turn into enemies [רלב״ג, אלשיך]. In a very specific scenario, this describes someone who steals from his own stingy parents in order to give to charity, sparking bitter arguments within his own family [אלשיך].
In sharp contrast to the greedy, proud, or wasteful individual, the person who trusts in God is gifted with deep peace of mind. He is entirely content with what he has, does not act with arrogance, and refuses to be dragged into arguments. Because he trusts that God will provide for his needs, he is rewarded with true abundance, enjoying good health, calm, and material wealth [רלב״ג, ביאור שטיינזלץ, מלבי״ם, מצודת דוד]. When it comes to spending, his trust in God means he only expands his budget for purposes related to God's commandments, such as honoring the Sabbath and holidays, fully believing that God will repay the debt and cover any financial loss [אלשיך].
Finally, there is an unusual understanding of the abundance promised to those who trust. If a greedy, argumentative person falsely claims to trust in God, expecting Him to save him despite his terrible behavior, the promised outcome is not wealth, but ruin. In this view, the concept of abundance transforms into ashes. Such a person deserves to be reduced to dust, serving as a reminder that true trust in God must always be paired with good character traits [עמנואל הרומי].