释义：圆的器物容易滚动，而方的器物则易于停止，这是器物的差异；金属刚硬而水则柔弱，这是它们的物性不同。
One man's constant is another man's variable.
The human heart is the most deceitful of all things, and desperately wicked. Who really knows how bad it is?
Wise men talk because they have something to say; fools, because they have to say something.
一个真正的决定是通过你采取了新的行动来衡量的。如果没有行动，你就没有真正决定。
朗兰兹纲领是对我们理解数学真理本质的挑战。