“Indeed the mind of Ilúvatar concerning you is not known to the Valar, and he has not revealed all things that are to come. But this we hold to be true, that your home is not here, neither in the land of Aman nor anywhere within the Circles of the World. And the Doom of Men, that they should depart, was at first a gift of Ilúvatar. It became a grief to them only because coming under the shadow of Morgoth it seemed to them that they were surrounded by a great darkness, of which they grew afraid; and some grew wilful and proud and would not yield, until life was reft from them.”
Book:The Silmarillion