It is not enough to observe and experiment, theorize and calculate. One must also imagine.

儿童应该得到成人的爱，而不是成人忙于生活所残余的爱。

科学不是形式逻辑；它和其他创造性艺术一样，需要思想的自由发挥。

You cannot hope to build a better world without improving the individuals. To that end, each of us must work for our own improvement and, at the same time, share a general responsibility for all humanity, our particular duty being to aid those to whom we think we can be most useful.