Christopher Paolini said this quote

“ If I have become my father, then I shall have my father's blade. Thorn is my dragon, and a thorn he shall be to all enemies. It is only right, then, that I should wield the sword, misery. Misery and Thorn, a fit match. Besides, Zar'roc should have gone to Morzan's eldest son, not his youngest. It is mine by right of birth. A cold pit formed in Eragon's stomach. It can't be. A cruel smile appeared on Murtagh's face. I never told you my mother's name, did I? And you never told my yours. I'll say it now: Selena. ”