/lit/ - Literature

Stories which portray immortality, actual immortality, usually focus on the concept of it being a curse that slowly drives men insane, as the centuries pass and the mind become ever more used to experiencing all that there is to experience, I want to ask however, what would happen if it didn't? What would happen if a person became, at the moment of ascension a snapshot of their personality, unable to progress or regress, experiencing the same level of excitement as they were capable on that very moment, forever? My plan is to make that a weakness as well, as they are unable to learn with new experiences, but what are some possible consequences of this differentiation that I might haven't foreseen yet?

Also does anyone knows how the eastern tradition deals with the concept of immortality? Did older western stories also play this theme of eternal life slowly driving a man insane?