§ Of Aulë and Yavanna The Silmarillion

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.'