He had a great reputation as a poet; Quintilian (Instit. x. I. 96) goes so far as to say that, with the exception of Horace, he was the only lyric poet worth reading.
In Classical rhetoric since Corax of Syracuse, especially in Institutio Oratoria of Quintilian, the digression was a regular part of any oration or composition.
Persius, Juvenal and Quintilian vouch for the admiration with which he was regarded in the first century of the empire.
The only ancient writer who mentions him is Quintilian (10.1.90), who laments his recent death as a great loss; as Quintilian's work was finished about 90 AD, this gives a limit for the death of Flaccus.
Tracing tactile learning tendencies back to Quintilian, Seguin, and Montessori, Fernald’s kinesthetic spelling and reading method prompted struggling students to trace words.
The author(s) of the Historia asserts that Postumus the Younger was a skilled rhetor, and that his Controversiae were included among Quintilian's Declamationes.
Gwynn, Aubrey S.J. Roman Education from Cicero to Quintilian. New York: Teachers College Press, 1926.
In his edition of Quintilian's Institutiones Oratoria ("Institutes of Oratory") Regius was the first to attempt corrections of the numerous errors ("depravationes") in Quintilian's text.
According to Tacitus and Quintilian, this work at their time was considered a very important Rome history reference book, especially for those historians who belonged to the Senatorial Party.
He also edited a number of classical texts for the Teubner series, the most important of which are Tacitus (4th ed., 1883); Rhetores Latini minores (1863); Quintilian (1868); Sulpicius Severus (1866); Minucius Felix together with Firmicus Maternus De errore (1867); Salvianus (1877) and Victor Vitensis's Historia persecutionis Africanae provinciae (1878).
He was educated in Hispania, a part of the Roman Empire which in the 1st century produced several notable Latin writers, including Seneca the Elder and Seneca the Younger, Lucan and Quintilian, and Martial's contemporaries Licinianus of Bilbilis, Decianus of Emerita and Canius of Gades.
In book 10, Quintilian - who was well-read with respect to both Greek and Latin rhetoricians, including Dionysius - gives advice to teachers who are instructing students in oration.
They are spoken of in the highest terms by Tacitus, Quintilian, and the younger Plinius, and were read even in a much later age, as one of them is quoted by the grammarian Charisius.
The so-called weak defense (which Quintilian makes as well as Ramus) suggests that rhetoric is separate from philosophy and one first becomes a good person and then can add good speaking on top (158).
Quintilian credited him with a vigorous and poetical genius and Julius Secundus, one of the speakers in Tacitus' Dialogus de Oratoribus styles him a perfect poet and most illustrious bard.