I found myself obliged, through perhaps unique circumstances, to devote myself to my mathematical research, almost without help, advice or even books... Endlessly occupied by a thousand different matters and constrained my state duties, it is the work of an engineer that I herewith present and not the fruit of the meditations of a savant.

Charles Dupin (1808) in: Hacette (1813; 86-87); as cited in Margaret Bradley, Charles Dupin (1784-1873) and His Influence on France, Cambria Press. p. 69