[52]
You should, therefore, avoid what is in controversy and test men's value in the light of what is generally agreed upon, if possible taking careful note of them when they present their views on particular situations; or, if that is not possible, when they discuss general questions. And when they are altogether lacking in what they ought to know, reject them （for it is clear that if one is of no use in himself, neither can he make another man wise）;
Isocrates. Isocrates with an English Translation in three volumes, by George Norlin, Ph.D., LL.D. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1980.
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