Amalar of Metz, Missae Expositionis Geminus Codex
, first paragraph of Codex I, quoted by Eleanor Shipley Duckett, Carolingian Portraits: A Study in the Ninth Century
(Ann Arbor: University of Michigan Press, 1962; rpt. 1988), p. 98:
If any reader of this work of mine suffers nausea as he gets to the end, he is not to blame me, but himself. Before he ever began to read it, he knew quite well how little renown I have for scholarship, and it is only his fault if he has stuck to it until the last page.
The Latin is probably in Jean Michel Hanssen, ed., Amalari Episcopi Opera Liturgica Omnia
, 3 vols. (Rome: Bibliotheca Apostolica Vaticana, 1948-1950 = Studi e Testi
, 138-140), which is unavailable to me.