xué'ér​bù​sī​zé​wǎng​sī'ér​bù​xué​zé​dài

learning without thought is confusing, thought without learning is dangerous

学而不思则罔,思而不学则殆 學而不思則罔,思而不學則殆 xué'ér​bù​sī​zé​wǎng​sī'ér​bù​xué​zé​dài
learning without thought is confusing, thought without learning is dangerous
A famous quote from Confucius's "Analects" meaning that learning without thinking leads to confusion, while thinking without learning from others' experiences is risky or exhausting.