 What is narrow mental content? Mental content simply means the content of a mental state such as a thought, a belief, a desire, a fear, an intention, or a wish. Content is a deliberately vague term; it is a rough synonym of another vague term, ‘meaning’. A state with content is a state that represents some part or aspect of the world; its content is the way it represents the world as being. For example, consider my belief that water is a liquid at room temperature. The content of this belief is what it says about the world, namely that a certain substance, water, has a certain property, being a liquid, under specified conditions, namely being at room temperature. Whether a belief is true or false depends on its content: it is true if the world really is the way the belief represents it as being; otherwise it is false.