The only purpose for which power can be rightfully exercised over any member of a civilized community， against his will， is to prevent harm to others.

Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.

"Positive psychology is not a spectator sport."

富贵不能淫，贫贱不能移。越是富贵，越是不能骄傲；越是贫穷，越要坚守志向。虽然尊敬贤能的人，但也不能贬斥那些愚笨不肖的人。