Faith

As long as we bear in my mind while reasoning that our reasoning may be 'baloney' we are not putting our 'faith' in anything. It's only when we and try to prove that reasoning isn't 'baloney' that we would enter into the circular argument, and therefore need to rely on 'faith'. The author ratherly cleverly tries to trick us in to doing so with the sentence 'He's wrong, of course, but can you prove it? Guess what? You can't.' Of course we can't!!! We just bear it in mind and carry on as best we can. This is pretty basic A-Level (in the UK anyway!) philosophy. It's stuff Descartes and Hume were torturing themselves over hundreds of years ago. The author's just added some clever wordplay to completely reverse the point of the argument in order to try and convince everyone they have faith, and therefore, he probably reckons, that they must be unconsciously be religous or some other such nonsense.