Excerpt from "Psychology and Alchemy" by Carl G. Jung

"The faint echo of the Fire Music--the Loki motif--is not out of key, for what does 'fulness of life' mean? What does 'wholeness' mean? I feel that there is every reason here for some anxiety, since man as a whole being casts a shadow. The fourth was not separated from the three and banished to the kingdom of everlasting fire for nothing. Does not an uncanonical saying of our Lord declare: 'Whoso is near unto me is near unto the fire'? Such dire ambiguities are not meant for grown-up children--which is why Heraclitus of old was named 'the dark,' because he spoke too plainly and called life itself and 'ever-living fire.' And that is why there are uncanonical sayings for those that have ears to hear."

This is, perhaps the most interesting heretical statement I have ever encountered. Jung's comparison of the Loki motif in his patient's dream to the "fourth [...] banished to the kingdom of everlasting fire" is a comparison of the symbolism of this "forth" to the unconscious as part of the quaternity, or the "squared triangle." The fourth, "Shadow,"--the unconscious--is that which must be repressed--"banished"--in the name of religious zeal; just as the Body or "flesh," as its lesser counterpart, must be controlled. His point is that such "dire ambiguities," representative of a transcendent truth, are intolerable to those immature members of the various religions, those who wish only to "drink the milk" of religion, to believe in whatever is easy to believe, everything that willingly represses the consideration of all such ambiguities.

(In case his analogy is not clear to the reader, Jung compares here the expulsion of Lucifer from the presence of the trinity Son, Father, and Holy Ghost to the repression of the Shadow from the consciousness of the trinity Self, Animus, Anima.)