In the 15th century, Marsilio Ficino put it as simply as possible. The mind, he said, tends to go off on it's own so that it seems to have no revelance to the physical world. At the same time, the materialistic life can be so absorbing that we get caught in it and forget about spirituality. What we need, he said, is soul, in the middle, holding together mind and body, ideas, life, spirituality and the world.
Source: Care of the Soul : A Guide for Cultivating Depth and Sacredness in Everyday Life, Pages: xiii
Contributed by: HeyOK