According to Decartes The three groups of thought is ideas(images), volitions(affects), and judgments. Decartes classifies his thoughts by grouping "all his thoughts into certain classes, and asking in which of them truth or falsity properly resides". For Ideas they are like images, and these images reside in your mind. For example, if I Imagine a unicorn, this mental image of this unicorn is in my head, so it's real. Therefore, ideas cannot be false, as he states "if they are considered alone and in their right, without being referred to something else, they cannot, properly speaking, be false". For volitions, it's an affect or a reaction to the idea. Therefore, volition can not be false as well, because when you react to an idea or image,
