He found/achieved 'immortality' through his films.
She believed in the 'immortality' of the soul.
(..) Because you might not like them. Because you may not know of what you speak. - What is he talking about? - I'm talking about her long life. The source of her immortality. She draws power from the Dark Dimension to stay alive. That's not true. I've seen the rituals, worked them out. (..)2016 Doctor Strange
(..) even death, which no one can control. Not even the great 'Doctor' Stephen Strange. Not even Dormammu? He offers immortality. It's our fear of death that gives Dormammu life. - He feeds off it. - Like you feed off him? You talk to me about controlling death. (..)2016 Doctor Strange