The Silmarillion

And in that time also, which songs call Nurtalë Valinóreva, the Hiding of Valinor, the Enchanted Isles were set, and ail the seas about them were filled with shadows and bewilderment. And these isles were strung as a net in the Shadowy Seas from the north to the south, before Tol Eressëa, the Lonely Isle, is reached by one sailing west. Hardly might any vessel pass between them, for in the dangerous sounds the waves sighed for ever upon dark rocks shrouded in mist. And in the twilight a great weariness came upon mariners and a loathing of the sea; but all that ever set foot upon the islands were there entrapped, and slept until the Change of the World. Thus it was that as Mandos foretold to them in Araman the Blessed Realm was shut against the Noldor; and of the many messengers that in after days sailed into the West none came ever to Valinor - save one only: the mightiest mariner of song.

Chapter 12 Of Men

The Valar sat now behind their mountains at peace; and having given light to Middle-earth they left it for long untended, and the lordship of Morgoth was uncontested save by the valour of the Noldor. Most in mind Ulmo kept the exiles, who gathered news of the Earth through all the waters.

From this time forth were reckoned the Years of the Sun. Swifter and briefer are they than the long Years of the Trees in Valinor. In that time the air of Middle-earth became heavy with the breath of growth and mortality, and the changing and ageing of all things was hastened exceedingly; life teemed upon the soil and in the waters in the Second Spring of Arda, and the Eldar increased, and beneath the new Sun Beleriand grew green and fair.

At the first rising of the Sun the Younger Children of Ilúvatar awoke in the land of Hildórien in the eastward regions of Middle-earth; but the first Sun arose in the West, and the opening eyes of Men were turned towards it, and their feet as they wandered over the Earth for the most part strayed that way. The Atani they were named by the Eldar, the Second People; but they called them also Hildor, the Followers, and many other names: Apanónar, the After-born, Engwar, the Sickly, and Fírimar, the Mortals; and they named them the Usurpers, the Strangers, and the Inscrutable, the Self-cursed, the Heavy-handed, the Night-fearers, the Children of the Sun. Of Men little is told in these tales, which concern the Eldest Days before the waxing of mortals and the waning of the Elves, save of those fathers of men, the Atanatári, who in the first years of the Sun and Moon wandered into the North of the world. To Hildórien there came no Vala to guide Men, or to summon them to dwell in Valinor; and Men have feared the Valar, rather than loved them, and have not understood the purposes of the Powers, being at variance with them, and at strife with the world. Ulmo nonetheless took thought for them aiding the counsel and will of Manwë; and his messages came often to them by stream and flood. But they have not skill in such matters, and still less had they in those days before they had mingled with the Elves. Therefore they loved the waters, and their hearts were stirred, but they understood not the messages. Yet it is told that ere long they met Dark Elves in many places, and were befriended by them; and Men became the companions and disciples in their childhood of these ancient folk, wanderers of the Elven-race who never set out upon the paths to Valinor, and knew of the Valar only as a rumour and a distant name.

Morgoth had then not long come back into Middle-earth, and his power went not far abroad, and was moreover checked by the sudden coming of great light. There was little peril in the lands and hills; and there new things, devised long ages before in the thought of Yavanna and sown as seed in the dark, came at last to their budding and their bloom. West, North, and South the children of Men spread and wandered, and their joy was the joy of the morning before the dew is dry, when every leaf is green.