The myth of Proteus powerfully displays the nature of Soul, exhibiting various archetypal faces. Drawn from the earliest Greek legends, Proteus appears as an old sea-god, Poseidon’s right-hand man, so to speak. He was said to be Poseidon’s shepherd of sea-beasts. According to Homer, he could see through all the depths of the sea. If one were to ensnare him, and, without releasing him, endure his shape-shifting tricks to the end, Proteus would reveal great knowledge of the present and future.
Source: soulspelunker.com