He who pours out thanks for a favourable verdict runs the risk of seeming to betray not only a bad conscience, but also a poor idea of the judge's office.

Francis Paget, preface to the 2nd ed. of "The Spirit of Discipline", 1906
http://www.archive.org/details/thespiritofdisc00pageuoft

The book also contains material on accidie (the Introductory Essay and the preface to the seventh edition), which is probably how I came across it.