要能夠以理性捍衛自己論點，不然你擁有的只是一種意見。 Be able to defend your arguments in a rational way. Otherwise, all you have is an opinion.

要能夠以理性捍衛自己論點，不然你擁有的只是一種意見。
Be able to defend your arguments in a rational way. Otherwise, all you have is an opinion. 
美國專欄作家  Marilyn vos Savant