Power always thinks it has a great soul and vast views beyond the comprehension of the weak; and that it is doing God's service when it is violating all His laws. Our passions, ambitions, avarice, love and resentment, etc., possess so much metaphysical subtlety and so much overpowering eloquence that they insinuate themselves into the understanding and the conscience and convert both to their party.
-- John Adams, in a letter to Jefferson, quoted in Reinhold Niebuhr, The Irony of American History.