> I know that I don't know
meh, obvi, how dumb must you be to think you know everything, pfft... I know everything that's important though.

> I know that I don't know
okay, there might be some important things I don't know yet... the priests know it though.

> I know that I don't know
ok, actually, it turns out there are some really important things that I neither know nor can ever hope to know... send help.