He had done as his dreams had told him, but dreams know more than they reveal

--- Neil Gaiman, in the Chapter "The Children of Loki" of his Norse Mythology (2017), p. 96.

In context:

Odin took the serpent to the shore of the sea that lies beyond all lands, the sea that circles Midgard, and there on the shore he freed Jormungundr, and watched it slither and slip beneath the waves and swim away in loops and curls.

Odin watched it with his one eye until it was lost on the horizon, and he wondered if he had done right thing. He did not know. He had done as his dreams had told him, but dreams know more than they reveal, even to the wisest of the gods.

Dream is the personalized myth, myth the depersonalized dream

--- Joseph Campbell, from The Hero With a Thousand Faces (from The Monomyth, ch. 1, “Myth and Dream”)

Extended quote:

Dream is the personalized myth, myth the depersonalized dream; both myth and dream are symbolic in the same general way of the dynamic of the psyche. But in the dream the forms are quirked by the peculiar troubles of the dreamer, whereas in myth the problems and solutions shown are directly valid for all mankind.

I found this via Steven Aizenstat, who said in Dream Tending: "A myth is a story that expresses something meaningful about a culture, from origins to values to sanctioned social interactions.   Every night the dreaming psyche is generating something of our own personal mythology, informing us about our origins, values, and so on."