Exactly A "chosen" one is you who chose (for) yourself.

I liked the idea from the christianity (in this case this was Jesus teachings) that any kind of knowledge can be gained for a diligent "researcher" (knowledge-gainer). But my view on immortality is that it has actually little to do with knowledge, and much more with the other than intellectual assets, more of mystic and energetic nature; i.e. immortality is an extension to conscious(-ness) development, increase of awareness, spirit orientation, deeper understanding (vs. learning intellectually) of life-processes vs. death / enthropy, embracing nature (in any sense), connecting to energy, and other stuff like that which ancient immortals were speaking of.

BTW I always loved to hear people's excuses why they cannot have / achieve something.