1, learning without thinking is useless, thinking without learning is dangerous. Meaning: learning without thinking will be blinded by the appearance of knowledge; Ignorant thinking will be more dangerous because of doubt.

2. Indulgence and diligence are wasted in drama, and actions are destroyed in thinking. -Han Yu. It means: learning is proficient because of diligence, but it is abandoned in laughter. Things succeed because of repeated thinking, but they can also be destroyed casually.

3. Meditation is labor, thinking is action. Hugo

I think, therefore I am. Descartes