The Book refers to knowledge of all kinds. The energy of it is both knowledge and learning, and for that reason, the Book is often used for education and intellectual pursuits. That being the case, when the Book refers to someone’s intelligence, it tends to refer more to academic knowledge, to someone being learned or very knowledgeable on an intellectual level.
The Fox, however, is about a different kind of intelligence entirely. The energy of this card is about playing your cards right, being street smart, learning from experience, learning what you need to survive – and using it. This is all about being cunning and clever, being smart rather than intellectual, having your wits about you.