Everything we see and experience in the world is without meaning. There is no good. There is no bad. But we project onto this “blank slate” all the meaning everything has. What this lesson is teaching us is that we are quite fearful of this meaninglessness. And the reason is that our ego sees this void and worries that if it doesn’t rush in and fill this empty space that its own impotence and unreality would be demonstrated. To which the Course says “And on this alone is it [the ego] correct.”