John Muir's ecofundamentalism regularly crossed the false boundaries separating love of God and love of nature. Muir attuned himself to the pulsating rhythms of the spirit throughout nature; he developed an earthlust spirituality that was both deeply Christian and robustly pagan at the same time. He practiced a "composting religion," to borrow the felicitous phrase of Mary Douglas, in which the culturally distinguished realms of the divine life, human life, and nonhuman life were wonderfully mixed together in heathen vision and nature ecstasy.
— Mark I. Wallace, Fragments of the Spirit