§ Akallabêth The Silmarillion

Now this yearning grew ever greater with the years; and the Númenóreans began to hunger for the undying city that they saw from afar, and the desire of everlasting life, to escape from death and the ending of delight, grew strong upon them; and ever as their power and glory grew greater their unquiet increased. For though the Valar had rewarded the Dúnedain with long life, they could not take from them the weariness of the world that comes at last, and they died, even their kings of the seed of Eärendil; and the span of their lives was brief in the eyes of the Eldar. Thus it was that a shadow fell upon them: in which maybe the will of Morgoth was at work that still moved in the world. And the Númenóreans began to murmur, at first in their hearts, and then in open words, against the doom of Men, and most of all against the Ban which forbade them to sail into the West.