Originally delivered as one of the St. Margaret"s Lectures for 1904, the contents of this booklet are focused on aspects of the Syriac-speaking Church. Extracted from Burkitt"s book Early Eastern Christianity, the third lecture concerns the theology of Eastern Christianity. Burkitt provides a brief survey of the work of Aphraates, Philoxenus of Mabbug, Ephraim the Syrian, and Rabbula.