A book is a mirror: if an ass peers into it, you can't expect an apostle to look out.
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones。
在数学中,发现的旅程往往比目的地本身更有价值。
The course of human life is not determined by drives or environment alone, but by creative self-direction as well.