"The thing is that this life is a big car, and inside the car there is a big engine. And in the engine there is a carburetor, which is hooked up to a fuel line. In some cars, before the fuel line hits the carburetor, there is a thing called a filter that makes sure the fuel going into the carburetor is pure. So in this life, the filter for our minds is the Knowledge, and if we are not being filtered properly, many dirty particles enter our minds and eventually the whole engine is destroyed."