\"我唯一知道的事，就是我什么都不知道\"。这是苏格拉底的一句格言

，听到这句话，可以想象，一千多年前的苏格拉底是多么的渴望认识世界，还有他谦虚的态度。

The impreciseness of the paraphrase of this as I know that I know nothing stems from the fact that Plato's Socrates is not saying that he does not know anything but means instead that he cannot know anything with the absolute certainty of seeing. Socrates feels confident only in his possibly being mistaken about what he has known through seeing given the power of the imagination...

http://en.wikipedia.org/wiki/I_know_that_I_know_nothing