Spiritual naturalism, or naturalistic spirituality combines a naturalist approach to spiritual ways of looking at the world. Spiritual naturalism may have first been proposed by Joris-Karl Huysmans in 1895 in his book En Route. Long before the term spiritual naturalism was coined by Huysmans, there is evidence of the value system of spiritual naturalism in Stoicism: "Virtue consists in a will that is in agreement with Nature".