Umberto Eco, The Name of the Rose (Everyman's Library

"What is love? There is nothing in the world, neither man nor Devil nor any thing, that I hold as suspect as love, for it penetrates the soul more than any other thing. Nothing exists that so fills and binds the heart as love does. Therefore, unless you have those weapons that subdue it, the soul plunges through love into an immense abyss."