§ Of Aulë and Yavanna The Silmarillion

Now Ilúvatar knew what was done, and in the very hour that Aulë's work was complete, and he was pleased, and began to instruct the Dwarves in the speech that he had devised for them, Ilúvatar spoke to him; and Aulë heard his voice and was silent. And the voice of Ilúvatar said to him: 'Why hast thou done this? Why dost thou attempt a thing which thou knowest is beyond thy power and thy authority? For thou hast from me as a gift thy own bring only, and no more; and therefore the creatures of thy hand and mind can live only by that being, moving when thou thinkest to move them, and if thy thought be elsewhere, standing idle. Is that thy desire?'