不以規矩，不能成方圓 [－－规－－－－－－圆]

Jyutping bat1 ji5 kwai1 geoi2 , bat1 nang4 sing4 fong1 jyun4
Pinyin bù yǐ guī ju , bù néng chéng fāng yuán

Definitions (CC-CEDICT)
  1. without rules, nothing can be done (idiom, from Mencius); one must follow some rules