“A righteous man eats to his soul’s fulfillment, but the stomach of the wicked is empty” (Proverbs 13:25).
A tzadik is carefree, for his is happy with whatever God gives him every day and confident that the next day God will again provide his meals. He eats as much as he needs without stinting to save for the next day. But a rasha, who relies on his own efforts, is always full of worries, so that even when he has plenty of food, he stints and goes hungry. ~ The Alter of Novhardok