A man who is careful in choosing friends will certainly derive benefit from them. Why?

一个谨慎选择朋友的人将会受益于他们的朋友，为啥？

A wise man should consider that health is the greatest of human blessings, and learn how by his own thought to derive benefit from his illnesses.

聪明人都认为拥有健康就是最大的福气，并且会通过自己的思考从疾病中学到些东西。