Philosophical antagonism and dispute by no means confined to the early modern period nonetheless enjoyed a moment of particular ferment as new methods and orientations on questions of epistemology and ethics developed in the seventeenth and eighteenth centuries. John Locke played a key part in them with controversies initiated by the Essay concerning Human Understanding (1690). This essay develops a wider typology of modes of philosophical quarrelling by focusing on a key debate the issue of whether human nature came pre-endowed with innate ideas and principles, resulting in a moral consensus across mankind, or remained, on the contrary, dependent on reason to achieve moral insight, and, in practice, divided by diverse and irreconcila...