Entry 0169: Remarks on the Principle of Non-Contradiction (III)
According to Franklin Perkins, Gottfried Wilhelm von Leibniz (1646-1716) “distinguishes between the explicit grasp of truths of reason or logic and an instinct for logic that everyone possesses. This instinct appears primarily in the avoidance of obvious contradictions. The capacity for reason depends [in part] on this instinctive use of the principle of non-contradiction.” 
↑ Franklin Perkins, “Interpreting China,” Chapter 4 in Leibniz and China: a commerce of light, Cambridge: Press Syndicate of the University of Cambridge, 2004, p. 160.