Truth is arrived at through rational reflection and observation of the natural world.

善不是出自内心的，不能保留；行为不能从自身辩明的，不能去做。善不是出自内心的，只能够勉强支撑一时，必然不能长久。所以也只能使伪善。

If you go back a few hundred years, what we take for granted today would seem like magic—being able to talk to people over long distances, to transmit images, flying, accessing vast amounts of data like an oracle. These are all things that would have been considered magic a few hundred years ago.

相关系数的可能误差不是一个固定的量，而是取决于样本的大小。

幸福在于成就的喜悦和创造努力的激动。