Titus Livius (Livy), The History of Rome, Book 35
Cyrus Evans, Ed.

19. Hannibal was not called to this consultation, having become suspected by the king, and not having subsequently been held in any honour, on account of his conferences with Villius, and he had not since shown him any mark of regard. [2] This affront, at first, he bore in silence; but afterwards thought it better to take some proper opportunity to inquire the reason of the king's suddenly withdrawing his favour, and to clear himself of blame. [3] Without any preface, he asked the cause of the king's displeasure; and having heard it, said, “Antiochus, when I was yet an infant, my father, Hamilcar, [p. 1572]at a time when he was offering sacrifice, brought me up to the altars, and made me take an oath, that I never would be a friend to the Roman people. [4] Under the obligation of this oath, I carried arms against them for thirty-six years; this oath, on peace being made, drove me out of my country, and brought me an exile to your court; and this oath shall guide me, should you disappoint my hopes, until I traverse every quarter of the globe, where I can understand that there are resources, to find out enemies to the Romans. [5] If, therefore, your courtiers have conceived the idea of ingratiating themselves with you by insinuating suspicions of me, let them seek some means of advancing their reputation otherwise than at my expense. [6] I hate, and am hated by, the Romans. That I speak the truth in this, my father, Hamilcar, and the gods are witnesses. Whenever, therefore, you shall employ your thoughts on a plan of waging war with Rome, consider Hannibal as one of your firmest friends. If circumstances force you to adopt peaceful measures, on such a subject employ some one else with whom to deliberate.” [7] This discourse not only affected the king much, but even reconciled him to Hannibal. They departed from the council with the resolution that the war should be undertaken.