Make up your mind to act decidedly and take the consequences. No good is ever done in this world by hesitation.  
There are no hard distinctions between what is real and what is unreal, nor between what is true and what is false. A thing is not necessarily either true or false; it can be both true and false.
追求高效算法的核心是一项数学努力,它挑战了我们对复杂性和可计算性的理解。