Sublimity!

As we've read earlier, Longinus has mentioned he five sources of sublimity.  With this post, I want to focus on one of the sources, which is the one where he states, "The first and most important is the power to conceive great thoughts," (Longinus 350).  He goes on to to talk about how great though is a "natural greatness" and the "most important."  I find this idea confusing.  The ideas he talks about on this is very vague in that he keeps throwing the words "noble" and "admired" around.  He doesn't really give a detailed explanation on how one can practically determine what great thoughts are.  Is it morally based? Does it have anything to do with being logically sound?  What about people that have been considered great leaders in our country that have not been able to conceive great thoughts?  One example I can think of is Stephen Hawking.  Although he is considered a genius, his inability to express these thoughts in a natural way seems to be artificial.  The fourth source is called "Noble diction," and it seems to not be able to relate with a lot of individuals.  Another individual I can think of is Helen Keller.  Considered a great leader by many for her ability to inspire many, it is unfortunate that the fourth source does not relate with her.  I thought of this as a little flaw in Longinus' argument?  Just food for thought I suppose.  The ideas about sublimity that Longinus proposes are very interesting and can be related with a lot of modern day people.