上下文系：匹夫不可以不慎取友.友者.所以相有也.道不同.何以相有也.
The word friend indicates sharing of interests (此处双关，一者有共同利益、二者有共同兴趣；所谓“只有永远的利益，没有永远的朋友”——译者注), background, objectives to achieve and, most importantly, doctrine (hence Tao, the way of pursuing one's goals).
Quoted from Records of Believes entitled Great Strategies (或音译，Dalve) by Tzu (或：Xunzi、Xun Kuang，荀况) during the Warring States period in ancient China
