Opera Quotes
"Moltke on the Art of War: Selected Writings" by Daniel J. Hughes and Harry Bell, (p. 92), 1993.
"The Truth". Book by Terry Pratchett, 2000.
Maurice de Saxe (2012). “Reveries on the Art of War”, p.67, Courier Corporation
The first rule in opera is the first rule in life: see to everything yourself
1925 Melodies and Memories.