Buonaparte's mind was, in its details, low and ungentlemanlike. I suppose the narrowness of his early prospects and habits stuck to him; what we understand by gentlemanlike feelings he knew nothing at all about.
Source, in full
Remarks to John Wilson Croker (1826), quoted in L. J. Jennings (ed.), The Croker Papers: The Correspondence and Diaries of the Late Right Honourable John Wilson Croker, LL.D., F.R.S., Secretary to the Admiralty from 1809 to 1830, Vol. I (1884), p. 339