The contrasting destinies of good and evil people are not random occurrences; they are determined entirely by God's personal providence [מאירי]. The primary approach among commentators is that these blessings come directly from God [רש״י, רד״ק, אלשיך, אבן עזרא]. The blessed individuals are the righteous who possess a generous spirit and give charity freely. In response to their generosity, God grants them wealth and honor.
Alternatively, another perspective suggests that the blessings and curses originate from the righteous person [מצודת דוד, ביאור שטיינזלץ]. Because of the righteous person's honesty and good deeds, God empowers his words. Therefore, anyone the righteous person blesses achieves success, and anyone he curses faces ruin.
The promise that the blessed will inherit the land represents true stability and permanence. Their success and wealth are not temporary. Instead, they will endure and be passed down securely to future generations, much like a family inheritance moving safely from father to son [רד״ק].
In sharp contrast stand the cursed individuals, identified as the wicked. These people are defined by their greed, their exploitation of others, and their ongoing refusal to pay their debts [רד״ק, אלשיך]. As a result of their actions, the wicked face a severe punishment of being completely cut off. This carries a dual consequence. First, their wealth and success will vanish without leaving any lasting legacy. Second, they themselves will be entirely uprooted, losing their place in both the present world and the World to Come [רד״ק].