I think the "life-paths" of both Bilbo and Frodo were sacred, rather than earthly. There were sort of tantamount to priests, in a way. They carried the burden of the Ring, which was their (sacred) duty, and which, in turn, took everything out of them that they had to give.
Sam, on the other hand, represented the earth-bound "life-path." While he, too, carried the Ring, it was only for a short period of time, and it didn't have the same effect on him that it did on Bilbo and Frodo.
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- Eve
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