Learning without thinking is useless; Thinking without studying will get you into trouble in your study.
If you always put your heart into it, you will live, but if you don't put your heart into it, you will suffocate. -Zou Taofen.
Think hard to make it more flexible, and don't use it to make it dull.
If you think, you will know, but if you don't think, you won't. -Mencius
The organ of the heart is thinking, you can get it by thinking, but you can't get it without thinking.