I was asked to contribute something about St Thomas Aquinas to this collection in honour of Kenelm—an activity rather like offering a short paper on Karl Marx in a festschrift for Lenin. Much of whatever understanding I have of Aquinas I owe to the insights and scholarly precision of Kenelm’s writings and I shall not in this paper attempt to play in his league. This will be an elementary introduction to an important part of Aquinas’s thinking which was neglected for some centuries and is only in our own receiving the attention it deserves. I am concerned with the virtue he calls prudentia. I have nothing original to contribute here (except perhaps some mistakes); what I will say will be new only to those to whom Aquinas is new, but there are perhaps, enough of these to justify yet another simple introduction.

As is almost always the case with Aquinas’s technical vocabulary, the nearest English word to the Latin one would be a mistranslation: prudentia does not mean what we call prudence. Prudence suggests to us a certain caution and canniness, whereas prudentia is much nearer to wisdom, practical wisdom.

Fortunately, however, we have a nearly perfect English equivalent in Jane Austen’s phrase ‘good sense’. I take Jane Austen to be centrally concerned not with presenting the ethos of the new respectable middle class but rather with the failure of the new bourgeoisie to live satisfactory lives because of the inability of the older ‘aristocratic’ tradition to transmit to them a certain outlook and way of behaving and education that came down to the author via the remains of a Christian morality.