grow you must push yourself beyond where you are. However, your mind is a marvelous thing and if you try to understand the contents, it will fill in the gaps. When I was in high-school quality essay in kannada language I learned a great deal about midi and electronic music simply by reading the specs out of musical instrument catalogs. By foreign I mean that you understand the words, but you dont really understand what is being said. When I started, I didnt understand half of what was written in the descriptions, but little by little things started making sense as I pieced together a bit of information from one description with a snippet of information from somewhere else.
If you dont understand a concept, chances are you can find a simpler explanation somewhere. However, I wonder if this is always good. Even though it might be hard, pressing through reading materials that you dont fully understand can be a very good way to gain comprehension in a new area. Obviously you cant pickup a book in a completely foreign language and expect to get anything out of it, but you can pickup a book on a topic where you dont really have the right prerequisite knowledge to understand 100 of the content and still. Many people would consider this a wastebecause you dont understand.