"Il y a des livres dont les dos et les couvertures sont de loin les meilleures parties"

Simplified Meaning:

Sometimes, books look really good on the outside with nice covers, but when you read them, they're not very interesting or well-written inside. This is like when you meet a person who seems great at first because they dress well or look nice, but when you get to know them, they don't have much of a personality or anything important to say. For example, you might buy a beautiful cookbook with amazing photos, but the recipes inside are hard to follow or don't work well. In life, it's important to look beyond appearances and get to know the real substance of things or people before making a judgment. This way, you focus more on what truly matters, instead of being misled by how things look on the outside. It's a reminder to value the quality and depth of something over its outward appearance.