Basically the title, I've looked for a scholarly source for this quote, but all I find is the quote with no context.
A close but not exact quote.
Herold credits this to Las Cases, Mémorial (6 Nov. 1816):
“The Emperor again fell silent, measuring distances on the
map with his calipers and asserting that Constantinople was by its situation
the center and seat of universal domination, etc,
Herold, J Christopher. The Mind of Napoleon. (1961). P. 202.