Preface -- Ch. 1. Why Thomas Aquinas in particular? -- Ch. 2. The liturgy in the life of the Doctor Angelicus. -- Ch. 3. Liturgy as Auctoritas in the theology of Thomas Aquinas. -- Ch. 4. The explanation of the Rite of the Mass in the Summa theologiae (III q. 83) -- Ch. 5. Central aspects of Thomist liturgiology -- Ch. 6. Quid hoc Sacramento mirabilibus? Real presence and transubstantiation -- Ch. 7. Thomas - The man of the new millennium -- Bibliography -- Index.