Комментарий к Мишлей 15:15

All the days of a poor man are wretched Even Sabbaths and festivals, as Samuel said. A change of diet is the beginning of intestinal disorders.

but he who has a cheerful heart One whose heart is cheerful with his wealth.

always has a feast All his years seem to him like days of feasting to teach you that a person should be happy with his lot (Avoth 4:1). And our Sages expounded [on this] in the chapter entitled Chelek (Sanh. 100b, 101a).