學而不思則罔，思而不學則殆 [学－－－则－－－－－学则－]

Jyutping hok6 ji4 bat1 si1 zak1 mong5 , si1 ji4 bat1 hok6 zak1 toi5
Pinyin xué ér bù sī zé wǎng , sī ér bù xué zé dài

Definitions (CC-CEDICT)
  1. To learn without thinking is confusing, to think without learning is dangerous (Confucius)