先友指祖先的友人，或者亡父的友人。
所谓欲知其人，先观其友，看一个人读什么书也能了解一个人，因人不仅能与人为友，还能与书为友。
A man may usually be known by the books he reads as well as by the company he keeps, for there is a companionship of books as well as of men.
注：为了让大家有一个更健康的讨论平台互相交流，你必须先登记成为风帆友，并在此登入你的风帆友身分。
Note: in order to let everyone to have a more healthy platform for discussion, you need to register as Wind Fans first, and to login your Wind Fans identity here.
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