旦夕祸福

旦夕祸福 [dàn xī huò fú]

1. ■ unexpected good or bad fortune; Fortune is fickle.; sudden changes of fortune:

人有旦夕祸福， 月有阴晴圆缺。 Men are subject to sudden changes of fortune as the moon is subject to the changes of being full and crescent, cloudy and clear.