所有人类行为都有以下七个原因中的一个或多个：机会、自然、强迫、习惯、理性、激情和欲望。

Style is as much under the words as in the words. It is as much the soul as it is the flesh of a work.

科学的进步不是一条直线，而是一系列曲折，有时在新的进展之前似乎会倒退。

一个人懒惰又奢侈，生活就会贫困；勤劳而节俭，生活就会富足。