And vise versa.
What!? Ignorance is knowledge?!?
Well look at it this way—once you have a piece of knowledge, you are equipped to ignore; once you don't know, you are equipped to look, to find out, to study. But if you are full of knowledge, why should you bother about anything? You know it all. You know where you're going, what you are doing, who you are and where you're at.
A person going about his business, full of the knowledge of all the things he is going to do, is an ignorant person. Knowledge is like a cocoon. To be full of knowledge is to ignore. And you have to ask: does Truth need knowledge? That about wraps it up.