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“Now Fëanor's heart was still bitter at his humiliation before Mandos, and he looked at Melkor in silence, pondering if indeed he might yet trust him so far as to aid him in his flight. And Melkor, seeing that Fëanor wavered, and knowing the the Silmarils held his heart in thrall, said at last: 'Here is a strong place, and well guarded; but think not that the Silmarils will lie safe in any treasury within the realm of the Valar!'
But his cunning overreached his aim; his words touched too deep, and awoke a fire more fierce than he designed; and Fëanor looked upon Melkor with eyes that burned through his fair semblance and pierced the cloaks of his mind, perceiving his fierce lust for the Silmarils. Then hate overcome Fëanor's fear, and he cursed Melkor and bade him be gone, saying: 'Get thee gone from my gate, thou jail-crow of Mandos!' And he shut the doors of his house in the face of the mightiest of the dwellers of Eä.”
― J. R. R. Tolkien