Augustine and the KK Principle

In On the Trinity 15.12.21, Augustine appears to endorse the KK principle (that if one knows that φ , then one knows that one knows that φ ) in the course of giving an argument – the Multiplicity Argument – against the Academic skeptics. Gareth Matthews has disputed Augustine’s endorsement of the KK principle and presented a different reading of the Multiplicity Argument. In this note, I show that Matthews’s construal of the Multiplicity Argument is both interpretively and technically defective and defend the attribution of some form of the KK principle to Augustine.