A grimoire ( ) is a textbook of magic, typically including instructions on how to create magical objects like talismans and amulets; how to perform magical spells; charms and divination; and how to summon or invoke supernatural entities such as angels, spirits, and demons. In many cases, the books themselves are believed to be imbued with magical powers, though in many cultures, other sacred texts that are not grimoires (such as the Bible) have been believed to have supernatural properties intrinsically. In this manner while all books on magic could be thought of as grimoires, not all magical books should.