All goes to show that the soul in man is not an organ, but animates and exercises all the organs; is not a function, like the power of memory, of calculation, of comparison, but uses these as hands and feet; is not a faculty, but a light, is not the intellect or the will, but the master of the intellect and the will; is the background of our being, in which they lie,--an immensity not possessed and that cannot be possessed.

The Works of Ralph Waldo Emerson: Comprising His Essays, Lectures, Poems, and Orations (ed. 1883)