§ Of the Beginning of Days The Silmarillion

For it is said that after the departure of the Valar there was silence, and for an age Ilúvatar sat alone in thought. Then he spoke and said: 'Behold I love the Earth, which shall be a mansion for the Quendi and the Atani! But the Quendi shall be the fairest of all earthly creatures, and they shall have and shall conceive and bring forth more beauty than all my Children; and they shall have the greater bliss in this world. But to the Atani I will give a new gift.' Therefore he willed that the hearts of Men should seek beyond the world and should find no rest therein; but they should have a virtue to shape their life, amid the powers and chances of the world, beyond the Music of the Ainur, which is as fate to all things else; and of their operation everything should be, in form and deed, completed, and the world fulfilled unto the last and smallest.