§ Of the Beginning of Days The Silmarillion

Now all is said concerning the manner of the Earth and its rulers in the beginning of days, and ere the world became such as the Children of Ilúvatar have known it. For Elves and Men are the Children of Ilúvatar; and since they understood not fully that theme by which the Children entered into the Music, none of the Ainur dared to add anything to their fashion. For which reason the Valar are to these kindreds rather their elders and their chieftains than their masters; and if ever in their dealings with Elves and Men the Ainur have endeavoured to force them when they would not be guided, seldom has this turned to good, howsoever good the intent. The dealings of the Ainur have indeed been mostly with the Elves, for Ilúvatar made them more like in nature to the Ainur, though less in might and stature; whereas to Men he gave strange gifts.