One of the things that will never get explained in the films is how Ben was able to retain his identity, because it happened somewhere between the third and fourth movies. I set up that this is a discipline that he learned from Yoda; Yoda told him how to do that.
George LucasThere wasn't much as a kid that inspired me in what I did as an adult, but I was always very interested in what motivates people, and in telling stories and building things.
George Lucas