The inaugural lectures Rigans Montes and Hic est liber were delivered by a young St. Thomas Aquinas upon his reception of the license to teach at Paris in 1256. Together, they discourse on the communication of Sacred Doctrine, with the second of the lectures dwelling on Sacred Scripture in particular and concluding with a division of its texts. Thomas's Commentary on the Psalms, on the other hand, is thought to be the reportatio of one of his final courses (c. 1253), never brought to completion; though this dense report may be limited to the essentials of Thomas's teaching, it is nonetheless packed with thoughtful, rich expository.