Master often says jade must be cut to become a vessel, so the training is especially strict.
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From 《礼记·学记》 (Book of Rites, 'Record of Learning'): 玉不琢，不成器；人不学，不知道 — 'jade uncarved is no vessel; a person unschooled does not know the way.' This couplet is the foundational Confucian argument for education as moral cultivation and has been drilled into Chinese schoolchildren for two millennia.
usage
Usually paired with its twin 人不学不知道 ('a person who does not study does not know the Way'). 琢 (zhuó) here is the jade-cutter's chisel — a deliberate, patient shaping, not a single blow.
