 Price can be classified as an Ethical Intuitionist in two respects. First, he rejects empiricism about our acquisition of knowledge, and espouses an intuitionist epistemology in ethics. Empiricists are mistaken in thinking that all knowledge has its basis in experience. There are a number of substantial necessary truths, essential to rational thought, which cannot be established by empirical methods, but which are self-evident. Reflection on them is sufficient to establish their truth. These include, as well as some mathematical and metaphysical truths, a number of fundamental moral principles.