"Hoyt's New Cyclopedia Of Practical Quotations" by Jehiel Keeler Hoyt, p. 267-70, Septem Sapientum Sententiæ Septenis Versibus Explicatæ, VII. 4, 1922.
Joseph Addison (1858). “Works, Including the Whole Contents of Bp. Hurd's Edition: Withletters and Other Pieces Not Found in Any Previous Collection; and Macaulay's Essay on His Life and Works”, p.505