Humanistic naturalism is the branch of philosophical naturalism wherein human beings are best able to control and understand the world through use of the scientific method, combined with the social and ethical values of humanism. Concepts of spirituality, intuition, and metaphysics are considered subjectively valuable only, primarily because they are unfalsifiable, and therefore can never progress beyond the realm of personal opinion. A boundary is not drawn between nature and what lies "beyond" nature; everything is regarded as a result of explainable processes within nature, with nothing lying outside it. Living Issues in Philosophy (4th ed.; New York: American Book Co., 1963): 215-221.
