A mathematician's work is never truly finished; there is always more to explore.

一只眼睛的人可以用来看水平仪，有毒的石头可以用来治疗痈疽。

Work hard, be kind, and never give up. Success will follow.

We've learned that change is necessary for growth.

If the job has been correctly done when a common stock is purchased, the time to sell it is—almost never.