Like justness in a judge's decision, or beauty in a painting, soul is a quality of absoluteness in something relative. Understood profoundly, people are connected to the holiness of the world in such a way that they reveal a dimension of holiness in themselves, a dimension of depth that is absolute.
The water in a vessel is sparkling; the water in the sea is dark. The small truth has words which are clear; the great truth has great silence.