Learning without thinking is a waste, thinking without learning is peril. ----Confucius

If the heart is used frequently, it will be alive; if it is not used, it will be suffocated. ----Zou Taofen

The organ of the heart is thinking, thinking is knowing, and not thinking is not possible. ----Mencius

Thinking is the seed of behavior. ----Emerson

To learn knowledge, you must be good at thinking, thinking, and thinking again. I relied on this learning method to become a scientist. ----Einstein

You cannot learn without thinking deeply. ----Yang Shi

If you think for a long time, blood and tears will drip from Bijian Mountain. ----Lao She

Think, continue to think, and wait for the dawn. Gradually, you will see the light. ----Newton

Think carefully and act diligently. ----Bai Juyi