- 不打不成器 bùdǎbùchéngqì spare the rod and spoil the child(idiom) a person can only be molded into something useful through strict discipline and training
- 玉不琢，不成器 yùbùzhuóbùchéngqì one must be disciplined to be a useful personliterally meaning jade must be carved to become a valuable vessel; used to mean that a person must undergo education, training, or hardship to develop their character and achieve great things