Attributed to Cosimo de' Medici, Duke of Florence, in Apothegms by Francis Bacon, (1624) No. 206
Cosimo Medici: Citáty v angličtine
Attributed to Cosimo de' Medici by Salviati; as cited in Taylor, F.H. (1948). The taste of angels, a history of art collecting from Rameses to Napoleon. Boston: Little, Brown. pp. 65–66.
Attributed to Cosimo de' Medici in: Jean Lucas-Dubreton (1961). Daily Life in Florence in the Time of the Medici. p. 58