Man's inwards are full of dung and filthiness, which is to denote what the inner man, which is often represented by various parts of his inwards--sometimes the heart, sometimes the bowels, sometimes the belly, sometimes the veins--is full of: spiritual corruption and abomination. So as there are many foldings and turnings in the bowels, it denotes the great and manifold intricacies, secret windings and turnings, shifts, wiles and deceits that are in their hearts.--Typological Writings, in vol. 11 of The Works of Jonathan Edwards (Yale University Press), 94
Say what you will, Edwards saw divine truth everywhere.
Think I'll pass on an image for this post.