Charged within the book's words was a powerful magical enchantment. If the reader completed the book within a period of 6 days, an activity that required a total of 48 hours of reading, the reader was endowed with a substantial improvement to mental capacities, including the ability to further extend them beyond natural capabilities.
- The githyanki knight Al'chaia, who led a detachment of githyanki inhabiting Stardock in the Year of Three Ships Sailing, 1492 DR,[note 1] owned a tome of clear thought and a manual of gainful exercise that she had falsely promised to share with her most accomplished soldiers.
- A copy of this book could be found among the magical books kept by the pharaoh Martek within his tomb.
- Canon material does not provide a year for the events described in Waterdeep: Dragon Heist, but Christopher Perkins answered a question via Twitter and stated the year was 1492 DR. Corroborating this, Dragon Heist page 20 refers to events of Death Masks (set in 1491 DR) as being "last year". Unless a canon source contradicts this assertion, this wiki will use 1492 DR for events related to this sourcebook and Waterdeep: Dungeon of the Mad Mage (which is referenced on pages 5 and 98 of Dragon Heist).
- Tome of Clear Thought article at the Baldur's Gate Wiki, a wiki for the Baldur's Gate games.
- D&D Beyond
- Mike Mearls, Jeremy Crawford, Christopher Perkins, James Wyatt (2014). Dungeon Master's Guide 5th edition. (Wizards of the Coast), p. 208. ISBN 978-0786965622.
- Gary Gygax (1979). Dungeon Masters Guide 1st edition. (TSR, Inc.), p. 124. ISBN 0-9356-9602-4.
- slade et al (November 1995). Encyclopedia Magica Volume IV. (TSR, Inc.), p. 1439. ISBN 0-7869-0289-2.
- Monte Cook, Jonathan Tweet, Skip Williams (July 2003). Dungeon Master's Guide v.3.5. (Wizards of the Coast), p. 268. ISBN 0-7869-2889-1.
- Christopher Perkins (November 2018). Waterdeep: Dungeon of the Mad Mage. Edited by Jeremy Crawford. (Wizards of the Coast), pp. 209–210. ISBN 978-0-7869-6626-4.
- Tracy Hickman, Laura Hickman, Philip Meyers, Peter Rice, William John Wheeler (May 1987). Desert of Desolation. (TSR, Inc.), p. 127. ISBN 978-0880383974.