§ Of the Silmarils and the Unrest of the Noldor The Silmarillion

Then Melkor lusted for the Silmarils, and the very memory of their radiance was a gnawing fire in his heart. From that time forth, inflamed by this desire, he sought ever more eagerly how he should destroy Fëanor and end the friendship of the Valar and the Elves; but he dissembled his purposes with cunning, and nothing of his malice could yet be seen in the semblance that he wore. Long was he at work, and slow at first and barren was his labour. But he that sows lies in the end shall not lack of a harvest, and soon he may rest from toil indeed while others reap and sow in his stead. Ever Melkor found some ears that would heed him, and some tongues that would enlarge what they had heard; and his lies passed from friend to friend, as secrets of which the knowledge proves the teller wise. Bitterly did the Noldor atone for the folly of their open ears in the days that followed after.