Oracles use 'chance' or 'randomness' through a selection of cards, throwing of dice, yarrow stalks or runes. In oracular devices chance is used to see what is hidden. If we don't see the hidden, that which we've denied and repressed, we are surprised by them when a crisis comes. The crisis may manifest physically before we pay attention to it, but it always has a psychological antecedent. Pain is feedback for healing.
Healing comes through accessing more and more of our whole selves.
Oracles can help us access the side of life we normally turn away from, or dare not believe. Without a method beyond the conscious control of the mind, you could not access the hidden side that is most needed for healing. I regard the oracular source as a cosmic intelligence that permeates every person, place and thing. Every situation is a particular convergence of intelligent information in a vast matrix of possibilities, that applies to a particular person, or event. Therefore an effective oracle is both comprehensive and specific.