Have a heart that never hardens, and a temper that never tires, and a touch that never hurts.
保持一颗永不僵硬的心，一种永不疲倦的性情，以及一种永不伤人的态度。
质量不是标签；它是一种标准。
The first man who， having enclosed a piece of ground， bethought himself of saying 'This is mine，' and found people simple enough to believe him， was the real founder of civil society.
The progress of mathematics is measured by the number of problems it can solve.
