Which argument for the existence of the soul suggests we know universals that are unaffected by physical changes?

The knowledge argument is grounded in the idea of universals and plays a significant role in discussions about the nature of the soul, particularly in the context of Plato's philosophy. This argument posits that humans have knowledge of abstract concepts, such as justice or beauty, which remain consistent and unchanged regardless of the physical state of the world or our individual experiences.

This suggests that if we can comprehend these unchanging truths, they must exist in a realm that is distinct from the physical, indicating the presence of the soul. This line of reasoning posits that the ability to grasp such universals is evidence for a non-physical essence within us, thereby aligning with the notion that the soul exists independently of material changes in the body or the environment. Such a perspective reinforces the argument for the soul's existence as an immaterial entity that possesses knowledge that is not contingent on the physical realm.