The value or worth of a man is, as of all other things, his price; that is to say, so much as would be given for the use of his power.
心灵是一个积极、动态的过程，而非被动的容器。
Don't fear failure; fear the absence of trying.
We can’t leave the problem-solving to the next generation. We have to do our part now.
在认识到热是运动的一种形式后，没有人会怀疑热可以转化为机械效应。