High Quality Content by WIKIPEDIA articles! 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. Concepts of spirituality, intuition, and metaphysics are not pursued because they are unfalsifiable, and therefore can never progress beyond 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 of it.