[narfforc]

'The Doom of the World,' they said, 'One alone can change who made it. And were you so to voyage that escaping all deceits and snares you came indeed to Aman, the Blessed Realm, little would it profit you. For it is not the land of Manwe that make it's people deathless, but the Deathless that dwell therein have hallowed the land; and there you would wither and grow weary the sooner, as moths in a light too strong and steadfast.'

This was the warning given to the The Numenoreans , I have always wondered how this statement affects Bilbo, Frodo and Gimli, and I believe it is the reason they could only go as far as Tol Eressea.