What is a commonplace book
Commonplace books are a method of compiling knowledge into one place, traditionally by handwriting but more recently with computers/word processors. They’re different from journals in that rather than containing exclusively personal thoughts or feelings, they’re a collection of external writings, informations, or other snippets of things recorded whenever it is encountered + usually organised.
To simplify – a commonplace book contains anything that captured it’s owners attention! Poems, extracts of fiction & non fiction writings, remarks or comments by others, anecdotes, observations, pertinent images, or other things along the same lines are all things that belong in a commonplace book!
Commonplace books have quite the history – their uses range between reading logs, reference books for students, and historically they were required by young women to demonstrate their upbringing.
The exact system you use in your commonplace book is entirely up to you and what you will remember to use. Usually information is organised under themed/topic-based headings, but this can be as flexible or stiff as the keeper desires. My personal commonplace book is organised by source material – all of my book extracts & notes are kept together and demarcated by paperclips.
A commonplace book has no requirements in terms of physical format, size, page type, etc. As long as it is something you will be able to keep using happily! There is also no rules around decorating any pages with stickers or washi tape, or any rules around using sticky notes to add information on the go.
A commonplace book can also be as expansive or restricted as possible in terms of subject matter. For example, I keep a specific commonplace book for Babalon & Sekhmet. Nothing else enters this book.
What’s their use in religious practice or witchcraft?
A commonplace book can function as an in-between for a Grimoire (a book of magical knowledge and instruction, usually written by someone else and usually for transmitting knowledge within a specific tradition or branch of religion/witchcraft) & a Witchbook/Book of Shadows (more akin to a magical/religious journal for recordkeeping). They’re also exceptionally useful if you read a lot of metaphysical, occult or spiritual/religious books and want to keep organised notes in a hard copy form!
Commonplace books can be used to record interesting information from other, non-metaphysical but useful sources too, foraging notes and recipes are an obvious choice to keep a record of, along with notes about celestial events from astronomy sources.
In some cases, a commonplace book can also be a devotional activity, or a shrine of sorts. Commonplace books as a devotional activity is easy to parse – collecting and mindfully recording information about an entity, deity, divinity or other spirit is a good means to show care and interest.
A commonplace book as a shrine has a similar function to an e-shrine on tumblr, by collecting things that remind or represent an entity, deity, divinity or other spirit, a notebook can be made into a shrine or sacred object. This can also be a useful way to have a sacred touchpoint with an entity and keep it relatively out of sight, for those who are not open about their practice.
More reading on Commonplace books
https://en.wikipedia.org/wiki/Commonplace_book - The wiki page for Commonplace books that delves into their general & regional history, along with more variations on memory/infokeeping under See Also
https://notebookofghosts.com/2018/02/25/a-brief-guide-to-keeping-a-commonplace-book/ - A brief history & how-to on commonplace books, along with notable people that kept one.
https://bookriot.com/commonplace-book/ - An informal look at commonplace books, including using a tumblr blog/other digital formats as a commonplace book.
https://medium.com/thrive-global/how-and-why-to-keep-a-commonplace-book-ea80e25b63f1 - Information about commonplace books, alternatives to notebooks, and a small guide.
