philosophy, doctrine, existence, unity, objects, conception, pure, essence, senses, individual, doctrines, philosophers, philosophical, evil, conceptions, distinct, abstract, logic, Hence, tendency, intellect, thinking, attributes, qualities, term, exists, Hume, conceived, conclusions, physical, priori, speculative, theological, assertion, causes, morality, meant, discussion, ethical, concept, supposed, attained, Mind, visible, asserted, creed, Plato, supernatural, consequences