learning without thinking is useless, and thinking without learning is dangerous. Xueé rù sī zī w ī ng, sī rī xī zī dà i.

Learning: learning, but thinking: thinking is useless: confusing: harmful

Learning only, but not thinking, is equal to learning in vain in the end; It becomes dangerous to think without learning.

-The Analects of Confucius. Governing.