§ Of Beren and Lúthien The Silmarillion

But Thingol looked in silence upon Lúthien; and he thought in his heart: 'Unhappy Men, children of little lords and brief kings, shall such as these lay hands on you, and yet live?' Then breaking the silence he said: 'I see the ring, son of Barahir, and I perceive that you are proud, and deem yourself mighty. But a father's deeds, even had his service been rendered to me, avail not to win the daughter of Thingol and Melian. See now! I too desire a treasure that is withheld. For rock and steel and the fires of Morgoth keep the jewel that I would possess against all the powers of the Elf-kingdoms. Yet I hear you say that bonds such as these do not daunt you. Go your way therefore! Bring to me in your hand a Silmaril from Morgoth's crown; and then, if she will, Lúthien may set her hand in yours. Then you shall have my jewel; and though the fate of Arda lie within the Silmarils, yet you shall hold me generous.'