He ate the fruit out of love for her, risking death and choosing her over immortal bliss.
It therefore seems natural to conclude that I know myself to be substantial, indivisible, enduring, perhaps even immortal, on the basis of self-awareness alone.
I do believe I would sell my immortal soul to make him mine.
Indeed, developments in science and the philosophy of mind make it increasingly difficult - though certainly not impossible - to maintain that humans have immortal souls.
In exchange for Johnson's immortal soul, the devil tuned his guitar, thereby giving him the abilities, which he so desired.
The fact that we do not have immortal souls does not justify unethical behavior.
It's true that exercising and eating well won't make you immortal.