Many of the present generation of Chaucer critics have been trained either as 'Robertsonians' or as 'Donaldsonians'. For Robertson, even those medieval poems which do not explicitly address religious issues were frequently intended to promote the Augustinian doctrine of charity beneath a pleasing surface; for Donaldson, there are 'no such poems in Middle English'. This chapter sets out the basics of the Augustinian doctrine of charity and of medieval allegorical theory and examines 'patristic' interpretations of Chaucer's work, particularly of the 'Nun's Priest Tale'. It looks at the humanist alternative to the patristic method and concludes with an assessment of the strengths and weaknesses of the patristic approach. The chapter argues that the 'Nun's Priest's Tale' can be seen as a satire of rhetorically inflated and over-serious accounts of the human condition.