What is the difference between "Oshek" and "Gezel"?
Radak: Oshek is money that came to a person from another, and he does not return it, or he owes to him money and keeps it. Gezel is forcibly taking another's money. Most people's money has some of these, therefore it does not last. Therefore, do not trust in it to be saved from affliction.
Malbim: Gezel is Hevel worse than Oshek.
Why does it say "Al Tehbalu"?
Radak: Trust in [such money] is Hevel (worthless).
What is the meaning of "Chayil Ki Yanuv"?
Rashi: If you see Resha'im, that their money succeeds and increases
Why does it say "Al Tashishu Lev"?
Radak, Malbim: Do not think that it will last; it will not last.
