If a person doesn't work hard when he is young, he will regret when he is old ―― laziness when he is young will make him regret when he is old; Reckless youth makes regretful old age; Idle youth, poor old age

Time is money, but money is not time.

idiom

Angry, forget to eat, forget to sleep, forget to eat, every second counts, burn ointment, crow, wear out the inkstone, study hard, practice hard, stay up all night, sleep all night, no winter, no summer snacks, eat all night, enjoy the log police pillow, learn to be brave, work hard, and never let go.