yùbùzhuóbùchéngqì
one must be disciplined to be a useful person
玉不琢，不成器 yùbùzhuóbùchéngqì
- one must be disciplined to be a useful person
- literally 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