Tornado Alley (PROG)

[brooklyn13]

"It was Plato who said, “He, O men, is the wisest, who like Socrates, knows that his wisdom is in truth worth nothing”

So Plato is giving wisdom about something, Socrates' knowledge, and at the same time implying that his (Plato's) wisdom is worth nothing? So, then, what's his point?

Is this a joke, some philosophy grad students' inside joke? To me it makes no sense, it's absolutely illogical.