Quintilian Institutio Oratoria 11.1.12

[12] In drawing this distinction between what is expedient and what is becoming, I have followed rather the usage of common speech than the strict law of truth; unless, indeed, the elder Africanus ¹ is to be regarded as having failed to consult his true interests, when he retired into exile sooner than wrangle over his own innocence with a contemptible tribune of the people, or unless it be alleged that Publius Rutilius ² was ignorant of his true advantage both on the occasion when he adopted a defence which may almost be compared with that of Socrates, and when he preferred to remain in exile rather than return at Sulla's bidding.