Thomas Paine (1794). “Paine's Age of Reason, with Remarks, Containing a Vindication of the Doctrines of Christianity from the Aspersions of that Author. By a Citizen of the World [i.e. James Tytler]”, p.73
Friedrich Nietzsche, Maudemarie Clark, Brian Leiter (1997). “Nietzsche: Daybreak: Thoughts on the Prejudices of Morality”, p.226, Cambridge University Press