Latin Pun

Roman has asked me to post to the blog a short joke / story I was told by an old friend:

I think it was Arch. (later Card.) Freeman who was lecturing at the Gregorian Uni. years ago. His nickname among the students was "Bull". In one of his lectures he faced up to and claimed to
have solved a problem which had left St Augustine and St Thomas Aquinas stumped. The saying went around "Augustinus nescit; Thomas nescit; sed Bull scit". I hope that doesn't scandalise you, but, unlike you, I am a sinner.