Even for an experienced reader of Latin, the Psalter sometimes follows underlying Greek and ultimately Hebrew idiom too literally and thus poses real difficulties. This new commentary on selected psalms, the first to be published for many years, seeks to resolve these problems by placing the Latin within its historical linguistic context. For the reader without Hebrew and only a little Greek, it clarifies how those languages, by bilingual interference and over-literal translation, have influenced and shaped idioms. Finally, it demonstrates how Early Christian exegetes, especially Augustine, confronted unidiomatic peculiarities in a fundamentalist way; specifically, how the resorted to an exegetical resolution of what they perceived as an underlying theological mystery.The psalms have been selected to illustrate the character of this Hebraising, Hellenising post-classical Latin. The commentary, with a glossary of grammatical terms, is accessible to both the beginner and the more advanced reader.