This fourth collection by Sebastian Brock focuses on three areas: the christology of the Church of the East, with the argument that the traditional characterisation of this Church as 'Nestorian' is not only unsatisfactory, but also thoroughly misleading; the distinctive phraseology of the invocations to the Holy Spirit in the Syriac liturgical tradition, hearkening back to Jewish roots; and two important early Commentaries on the Liturgy.