'', 1828
De Divinatione is set in two books, taking the form of a
dialogue whose
interlocutors are Cicero himself (speaking mostly in Book II, and including a fragment of Cicero's poem on his own consulship) and his brother
Quintus. Book I deals with Quintus'
apologetics in favor of divination (in line with his essentially
Stoic beliefs), while Book II contains Cicero's refutation of these from his
Academic skeptic philosophical standpoint. Cicero concerns himself in some detail with the types of divination, dividing them into the "inspired" type (Latin
furor, Gk.
mania, "madness"), especially dreams, and the type which occurs via some form of skill of interpretation (i.e.,
haruspicy,
extispicy,
augury,
astrology, and other
oracles).
De Divinatione may be considered as a supplement to Cicero's
De Natura Deorum. In
De Divinatione, Cicero professes to relate the substance of a conversation held at Tusculum with his brother, in which Quintus, following the principles of the
Stoics, supported the credibility of divination, while Cicero himself controverted it. It is sufficient, that we know from experience and history that they do happen. Quintus offers various accounts of the different kinds of omens, dreams, portents, and divinations. For example, he argues that he dreamt of Marius during his banishment because he often thought about him, not because it was some sort of omen. He states that during one's sleep, the soul is in a relaxed state and remnants of one's waking thoughts move freely within the soul. Using an example where an unnamed interpreter and Antipho interpret an Olympic runner’s dream as both a victory and defeat, he suggests that that divination is based on the interpretation of the augur, and has no logical grounds or skill.
Cicero also disagrees with
Cratippus’s certainty of the existence of divination. He states that prophecies come true due to luck or chance, while mythical tellings of
Oracles are myths, and should not be taken for fact. He further criticizes the ‘riddles’ that divination and ‘dream messages’ provide. He questions whether the gods genuinely intend to warn mortals of the future if such omens are obscure and prone to misunderstanding. Book Two concludes with a chapter on the evils of superstition, and Cicero's efforts to extirpate it. ==Divination in a Military Context==