Is There Something External to the World That Contain Within Its Reason for Its Existence?

This is what i took to be a his argument, and then there'll be the clarification version. So, premise one, there are some beings in the world which do not contain within themselves the for their existence. The next premise i put in here is just the linking premise, so that we can get a valid argument where the conclusion follows from the premises. Now, later we'll see, he does say a few more things to draw out a little bit more about what kind of a thing this would be. Not much more, but a littlebit more.