The Silmarillion

Then Aulë took the Seven Fathers of the Dwarves, and laid them to rest in far-sundered places; and he returned to Valinor, and waited while the long years lengthened.

Since they were to come in the days of the power of Melkor, Aulë made the Dwarves strong to endure. Therefore they are stone-hard, stubborn, fast in friendship and in enmity, and they suffer toil and hanger and hurt of body more hardily than all other speaking peoples; and they live long, far beyond the span of Men, yet not for ever. Aforetime it was held among the Elves in Middle-earth that dying the Dwarves returned to the earth and the stone of which they were made; yet that is not their own belief. For they say that Aulë the Maker, whom they call Mahal, cares for them, and gathers them to Mandos in halls set apart; and that he declared to their Fathers of old that Ilúvatar will hallow them and give them a place among the Children in the End. Then their part shall be to serve Aulë and to aid him in the remaking of Arda after the Last Battle. They say also that the Seven Fathers of the Dwarves return to live again in their own kin and to bear once more their ancient names: of whom Durin was the most renowned in after ages, father of that kindred most friendly to the Elves, whose mansions were at Khazad-dûm.

Now when Aulë laboured in the making of the Dwarves he kept this work hidden from the other Valar; but at last he opened his mind to Yavanna and told her of all that had come to pass. Then Yavanna said to him: 'Eru is merciful. Now I see that thy heart rejoiceth, as indeed it may; for thou hast received not only forgiveness but bounty. Yet because thou hiddest this thought from me until its achievement, thy children will have little love for the things of my love. They will love first the things made by their own hands, as doth their father. They will delve in the earth, and the things that grow and live upon the earth they will not heed. Many a tree shall feel the bite of their iron without pity.'

But Aulë answered: 'That shall also be true of the Children of Ilúvatar; for they will eat and they will build. And though the things of thy realm have worth in themselves, and would have worth if no Children were to come, yet Eru will give them dominion, and they shall use all that they find in Arda: though not, by the purpose of Eru, without respect or without gratitude.'

'Not unless Melkor darken their hearts,' said Yavanna. And she was not appeased, but grieved in heart, fearing what might be done upon Middle-earth in days to come. Therefore she went before Manwë, and she did not betray the counsel of Aulë, but she said: 'King of Arda, is it true, as Aulë hath said to me, that the Children when they come shall have dominion over all the things of my labour, to do as they will therewith?'

'It is true,' said Manwë. 'But why dost thou ask, for thou hadst no need of the teaching of Aulë?'

Then Yavanna was silent and looked into her own thought. And she answered: 'Because my heart is anxious, thinking of the days to come. All my works are dear to me. Is it not enough that Melkor should have marred so many? Shall nothing that I have devised be free from the dominion of others?'

'If thou hadst thy will what wouldst thou reserve?' said Manwë. 'Of all thy realm what dost thou hold dearest?'

'All have their worth,' said Yavanna, 'and each contributes to the worth of the others. But the kelvar can flee or defend themselves, whereas the olvar that grow cannot. And among these I hold trees dear. Long in the growing, swift shall they be in the felling, and unless they pay toll with fruit upon bough little mourned in their passing. So I see in my thought. Would that the trees might speak on behalf of all things that have roots, and punish those that wrong them!'

'This is a strange thought,' said Manwë.

'Yet it was in the Song,' said Yavanna. 'For while thou wert in the heavens and with Ulmo built the clouds and poured out the rains, I lifted up the branches of great trees to receive them, and some sang to Ilúvatar amid the wind and the rain.'

Then Manwë sat silent, and the thought of Yavanna that she had put into his heart grew and unfolded; and it was beheld by Ilúvatar. Then it seemed to Manwë that the Song rose once more about him, and he heeded now many things therein that though he had heard them he had not heeded before. And at last the Vision was renewed, but it was not now remote, for he was himself within it, and yet he saw that all was upheld by the hand of Ilúvatar; and the hand entered in, and from it came forth many wonders that had until then been hidden from him in the hearts of the Ainur.