According to Aristotle, it is from sense experience that we obtain the universal concepts and principles of a science. Thus, if someone lacks a sense, he will also lack the scientific knowledge involving the concepts and principles derived from exercise of that sense. But Grosseteste holds that God and the intelligences (i.e., angels) know without reliance on the senses, and the intellective power, the highest part of the human soul, relies on no bodily sense or organ in its proper operation. Instead, its proper operation involves a mental vision in which one arrives at knowledge of things by viewing their exemplar forms or reasons in an irradiation received from God or an intelligence.