A greedy person stirs up strife: a רחב נפש, one “wide of soul,” is one whose desiring soul is very wide, and who finds no end to his desire. “He stirs up strife” and complaints against the way Hashem runs [the world], since he does not find what he desires; and he thinks that the whole world was created for his harm, and he complains always about the ways of Hashem. But “one who trusts in Hashem,” and does not crave, and is content with what he has, and trusts that Hashem will provide what is needed for his livelihood, he “will prosper,” for he will find what he needs; as the Rambam wrote in [his] explanation of “G-d made man upright, but they have sought many schemes” (Koheles 7:29); see there.