Discovering What You Don't Know

"When you discover what you don't know, what's left?"

I think this is a question that more people should give greater thought to. There is no shame in not knowing something; even people with PHD's, people who have devoted their entire lives to learning and education, cannot know everything. There is shame, however, in not expanding upon one's knowledge and becoming more educated. When you discover what you don't know, everything is left to you and everything is open to you. No doors are closed unless you refuse to pass through them and the amount of knowledge that you can gain is unending.