From what I was told Lucifer feared being non-autonomous.

 So, with the permission of God, Lucifer plunged Creation into rebellion. It was Lucifer's act & not God's, but Lucifer wished to be the most glorious angel. The problem is that Lucifer was acting very foolishly. He's a titan. An angel. He didn't realize how weak all the other beings were. "They were too weak." We are too weak. God explained to me that he wanted to be too rich. Because by having Hell & Earth he does have "fellowship with devil's." 'Fellowship with Devil's' is forbidden by St. Paul.