There are things that you should find in your Book of Shadows, and then there are those that have no place in such a sacred book.
You’ve got to keep in mind the purpose of having a Book of Shadows, which is to have a record of your magickal experiences and spiritual journey. It is something that you can preserve and look back on 10 years down the road and even pass it on to your daughters and granddaughters who show an interest in Wicca. Your Book of Shadows can serve as a reference material to future witches in your family.
There aren’t any absolute rules as to what you can place in your Book of Shadows, but it’s better to steer clear of the things I will talk about below:
Anything that has nothing to do with Wicca or Magick
Your Book of Shadows is your account of your spiritual journey in Wicca. This is not the place to write out your grocery list, and it is not the place to compute your bills. It is for spells, magickal thoughts, dream interpretations, rituals, etc. This is also one way to keep it sacred, to write only entries that have to do with magick.
When you are in the heat of the moment, you might be tempted to write down hateful thoughts you have about your partner, your mother, or your work mate. I understand how helpful that can be to blow off steam, but it’s best to have a separate diary for that. Have a separate journal that serves as your daily diary. Keep your Book of Shadows free from anything that you will regret reading about in the future. As negative moods go, they do fade and you do move on and forget about them. Spare your Book of Shadows the negativity that will be in its pages forever.
Wicca is not about black magick but white magick and purity. If you read enough about Wicca, you know it is the path of peace, nature-loving, and grounding. It is not simply WITCHCRAFT where you cast spells without the help of the Divine.
Don’t forget the Wiccan Rede: “An Ye Harm None, Do As Ye Will” and the threefold law. Engaging in black magick will put you on the bad side of the Divine.
Someone else’s entries
When I say someone else’s entries, you should not let anyone write in your Book of Shadows with their personal entries. Every witch should have his or her own Book of Shadows that cannot be accessed by anyone, not even their partner.
This is YOUR account of YOUR spiritual journey. If a friend wants to write down thoughts, she or he should get her or his own Book of Shadows. This should be common sense, but you’d be surprised how boundaries can be blurred when it comes to friendships.
So there you have it. There is really not a lot you cannot write in your Book of Shadows. It is very easy to get it right and hard to get it wrong. If you follow these suggestions, you will be pleased in the future when you want to look back and reread your entries, just to see how much has changed in you. You will be thankful that Joanne’s dress size or how Mandy looked hideous in that dress at your cousin's wedding, or the accounting of July 2016’s bills did not make an appearance in your sacred Book of Shadows.