If men were angels, no government would be necessary. If angels were to govern men, neither external nor internal controls on government would be necessary. In framing a government which is to be administered by men over men, the great difficulty lies in this: you must first enable the government to control the governed; and in the next place, oblige it to control itself.
James Madison
Federalist No. 51
February 8, 1788

James Madison
March 16, 1751 - June 28, 1836