What is the spectre haunting Europe today? It’s simple. The thing that truly dogs us, that really drags at our heels, is ignorance. Ignorance of the fundamental ideas at the heart of politics. Ignorance of the key terms of political argument: liberty, equality, power, justice, and so on. Ignorance of the subject matter of political philosophy.
This ignorance is a spectre precisely because it is invisible to us. You might, for example, not know how a microwave works. But you know you do not know that. Now imagine there are purple aliens growing yellow mushrooms on the other side of the moon. In this case you are unaware that you unaware of them.