Be able to defend your arguments in a rational way. Otherwise, all you have is an opinion.

Be able to defend your arguments in a rational way. Otherwise, all you have is an opinion.

能够以理性的方式为自己的论点辩护。否则，你只有一个观点。

-- Marilyn vos Savant 玛丽莲·沃斯·莎凡特