"Because he wanted to be the last, the one, the only. He sought immortality so that there would be no need to continue on with the lineage of the Sith. I have heard things about the future that have made his quest all the more...disturbing now that I know the truth." In hindsight, so many of his actions that had seemed strange at the time added up and made sense when they were all lined up and put together.

"Being told absolutes such as that serve no purpose for either Sith or Jedi. The Dark Side can have a purpose for both sides, especially if one learns control. Fire can be destructive and burn down whole forests if left unchecked, but a small campfire you control can keep you warm." By that token, there was also a place for the Light Side in Maul's life. Even if he didn't try to touch it directly himself, he'd been shaped for the better by the Jedi in his life who let it flow through them like Luke, Obi-Wan, and Ezra.