相信一个人不仅仅是个人，这是多么危险的想法。

你送给我桃子，我就回报给你李子。意思是做人要知恩图报，不能忘恩负义。也比喻礼尚往来，相互赠送礼物。

The same principles which at first view lead to skepticism， pursued to a certain point， bring men back to common sense.

心智通过练习而非被动吸收而成长。

Science is the art of making the complex understandable.

The typewriting machine, when played with expression, is not more annoying than the piano when played by a sister or near relations.