This is a well-reasoned and easy to follow description of the difference between God and everything else. It is a good introduction for, among many other subjects, the philosophical question of objective morality.
R.C. Sproul: Before the Beginning: The Aseity of God - Bing video
Edit: post #8 has a poor synopsis, for those who don't have the time or data limits or inclination.
I don't see any reasoning at all, just unargued assertions. He simply asserts that to have real being means to be unchanging. Why? because he rejects the identity of change. Is not the ability to change a part of an existent's identity? Blank out.
It's pure rationalism is what it is and it's special pleading. It also rests on stolen concepts. And, it's no surprise that he invokes Kant since Kant was also a subjectivist.
The fact that existence exists does not change. The things that exist change and they do so according to their nature because change is part of their identity. But I guess if you accept as true that water can turn into wine by means of essentially wishing by a ruling consciousness one would have to deny this fact.
What's missing here is a method for distinguishing this thing he calls God from something that is merely imaginary. I can say the same things that he is saying about his God in regards to anything I can imagine. I can assign any attributes or states or qualities to something I'm merely imagining. I can talk about the aseity of Sparky the Wonder Unicorn and I can say that Sparky is, everything else is becoming. I can also give Sparky, which is completely a product of my imagination, the attribute of necessity. Sparky the Unicorn is a necessary being who is the first cause and it just is and everything else is contingent. The problem is that imagination is not a means of discovering what exists.
As far as objective morality the notion of objective morality rests on the principle of objectivity which is the primacy of existence. The notion of God affirms the primacy of consciousness, which is a complete negation of objectivity. Mr. Sproul should learn that using concepts like "objectivity" while ignoring their genetic roots is fallacious.
The basis of objective morality is the axiom of identity and the primacy of existence. That is all one needs to ground morality objectively.
He would know this if he had any kind of theory of concepts but Christianity does not. Of course, he is speaking to the choir. Let him make this presentation to a room full of Objectivists
He clearly accepts the false dichotomy known as the necessary/contingent dichotomy which has its roots in a flawed theory of concepts. Does he understand this or does he just accept this dichotomy without questioning it?
When Apologists used to come to my home they would ask me -this is how childish their reasoning was-, to look at the trees and the clouds. Then they would ask me where I thought these things came from.
My answer: They came from existence. That would be the end of it because they were at least smart enough to know not to ask me where I thought existence came from. I'll give them that. Unfortunately, they don't come around anymore even though I've invited them to come back anytime they have more questions.