The best way to be happy is to let go of what you can’t control.
在数学的领域里,每一个问题都是发现新事物和深刻见解的机会。
世界上最好和最美丽的东西是看不见甚至摸不着的——它们必须用心去感受。
You can tell more about a person by what he says about others than you can by what others say about him.  
恐惧是一个暗室,负片在那里显影。