The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.

The light of truth never goes out.

The essence of learning is the acquisition of meanings.

发现的兴奋感永远不会过时。

The key to success is to keep learning and adapting.

"Survival is not just about strength, but about adaptability."

现代采石必须将地质学的智慧与工程的创新相结合。