There is besides a story, that Hannibal, when about nine years old, while he boyishly coaxed his father Hamilcar that he might be taken to Spain, (at the time when the African war was completed, and he was employed in sacrificing previously to transporting his army thither,) was conducted to the altar; and, having laid his hand on the offerings, was bound by an oath to prove himself, as soon as he could, an enemy to the Roman people.
Hor Book XXI Chapter 1: Introduction and youth of Hannibal

I am of opinion, that this youth should be kept at home, and taught, under the restraint of the laws and the authority of magistrates, to live on an equal footing with the rest of the citizens, lest at some time or other this small fire should kindle a vast conflagration."
Hor Book XXI Chapter 3: Hannibal to succeed Hasdrubal
By Hanno

There never was a genius more fitted for the two most opposite duties of obeying and commanding
Hor Book XXI Chapter 4: Hannibal's character

His fearlessness in encountering dangers, and his prudence when in the midst of them, were extreme. His body could not be exhausted, nor his mind subdued, by any toil. He could alike endure either heat or cold. The quantity of his food and drink was determined by the wants of nature, and not by pleasure
Hor Book XXI Chapter 4: Hannibal's character

Excessive vices counterbalanced these high virtues of the hero; inhuman cruelty, more than Punic perfidy, no truth, no reverence for things sacred, no fear of the gods, no respect for oaths, no sense of religion.
Hor Book XXI Chapter 4: Hannibal's character

Hannibal himself contracted a disorder in his eyes, at first from the unwholesomeness of the vernal air, which is attended with transitions from heat to cold; and at length from watching, nocturnal damps, the marshy atmosphere disordering his head, and because he had neither opportunity nor leisure for remedies, loses one of them.
Hor Book XXII Chapter 2: Hannibal marches through the Apennines

Next the plans and temper of the consul, the situation of the country, the roads, the sources from which provisions might be obtained, and whatever else it was useful to know; all these things he ascertained by the most diligent inquiry
Hor Book XXII Chapter 3: Flaminius

Savage and ferocious from nature and habit, their general has rendered them still more so, by forming bridges and works with heaps of human bodies; and, what the tongue can scarcely utter, by teaching them to live on human flesh.
Hor Book XXIII Chapter 5: Speech of Terentius
By Gaius Terentius Varro

Will you be able to bear the look of Hannibal himself, which armed hosts cannot sustain, from which the Roman people shrink with horror?
Hor Book XXIII Chapter 9: His father persuades him not to do it
By Pacuvius Calavius

That of less importance was, that he was informed by one of his prisoners, that the very ground on which his camp stood was sold at this very time, without any diminution in its price. Indeed, so great an insult and indignity did it appear to him that a purchaser should be found at Rome for the very soil which he held and possessed by right of conquest, that he immediately called a crier, and ordered that the silversmiths' shops, which at that time stood around the Roman forum, should be put up for sale.
Hor Book XXV Chapter 11: The citadel is besieged