Concealment Quotes
John Burroughs, Charlotte ZoĆ« Walker (2001). “The Art of Seeing Things: Essays”, p.8, Syracuse University Press
Epistulae ad Lucilium LVI
"Hoyt's New Cyclopedia Of Practical Quotations" by Jehiel Keeler Hoyt, p. 695-96, Oedipus, 826, 1922.