The moment you give up is the moment you let someone else win.

战场交锋，即使列阵有方，但以勇猛为本；操办丧事，即使礼节周全，但以哀痛为本；文人学士，即使学富五车，但以德行为本

解释：看见美丽的容貌就心悦，是人之常情。

数学是一门活生生的学科，随着新思想的出现而不断发展。

Success comes from persistence and focus.

The teacher's task is not to implant facts but to place the subject to be learned in front of the learner and, through sympathy, emotion, imagination, and patience, to awaken in the learner the restless drive for answers and insights which enlarge the personal life.

We are all haunted by the shadows of our former selves.