11 Wealth gotten by vanity shall be diminished: but he that gathereth by labour shall increase.
This shows that riches wear as they are won and woven.
1. That which is won ill will never wear well, for a curse attends it which will waste it, and the same corrupt dispositions which incline men to the sinful ways of getting well incline them to the like sinful ways of spending: Wealth gotten by vanity will be bestowed upon vanity, and then it will be diminished. That which is got by such employments as are not lawful, or not becoming Christians, such as only serve to feed pride and luxury, that which is got by gaming or by the stage, may as truly be said to be gotten by vanity as that which is got by fraud and lying, and will be diminished. De male quæsitis vix gaudet tertius hæres–Ill-gotten wealth will scarcely be enjoyed by the third generation.
2. That which is got by industry and honesty will grow more, instead of growing less; it will be a maintenance; it will be an inheritance; it will be an abundance. He that labours, working with his hands, shall so increase as that he shall have to give to him that needs (Eph. 4:28; and, when it comes to that, it will increase yet more and more.
– Matthew Henry Commentary