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。
We must build networks that are born green, not just made green.
Prophesying was the only human art that couldn't be improved by practice.
唯一具有持久重要性的自由是智慧的自由,也就是说,为了本质上值得的目的而行使的观察和判断的自由。