Good econometrics is like good carpentry—it's all about using the right tool for the job.

The most important property of a program is whether it accomplishes the intention of its user.

The elegance of a mathematical proof is in its simplicity and clarity.

We are all visitors to this time, this place. We are just passing through. Our purpose here is to observe, to learn, to grow, to love... and then we return home.

The secret to my success is staying true to myself.

Innovation requires both courage and patience.

我不是理论家。我不是知识分子。我靠直觉行事。

健康的森林是有韧性的森林。