数学不是关于数字、方程、计算或算法的:它是关于理解的。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
The most perfect education, in my opinion, is such an exercise of the understanding as is best calculated to strengthen the body and form the heart.
相信你的直觉,它们知道方向。
The most important property of a program is whether it accomplishes the intention of its user.
仁慈的人容易认为,一定有一种巧妙的方法,不必造成太大的伤亡就能解除敌人的武装或者打垮敌人,并且认为这是军事艺术真正发展的方向。这种看法不管多么美妙,都是必须消除的错误思想,因为在像战争这么危险的事情中,由仁慈而产生的错误思想正是最为有害的。