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After introducing the entire collection of Thomas’ preaching which is now available – the four series of Lent sermons as well as the corpus of twenty three sermons edited by Fr. L. J. Bataillon in vol. 44, 1 of the Leonine Edition – the present article looks at predication as a literary genre and shows that a correlative reading of Thomas’ sermons and his other works helps substantiate the lacunae that are characteristic of the sermons that result from reportationes. A combined study of these unquestionably authentic sermons and of Thomas’ other works reveals that he developed a Trinitarian theology of predication. The article then establishes a classification of the various applications of philosophy in predication and its use in the Aquinate. It examines the relation between philosophy and theology and Thomas’ argument against what is commonly described as the doctrine of the double truth. Amidst the theological topics addressed, the article deals with Trinitarian appropriations in relation to predication and salvation as well as providence and theological anthropology in relation to the theme of man as an image of God. The close examination of Thomas’ sermons clearly proves his ability to capitalize on his speculative reflection to develop a form of preaching both easy to understand and profound, suitable to his audience and rich in practical instruction. The analysis of a sermon on the education of young students uncovers a picture of Thomas as a religious, a scholar and a preacher.