Suppose someone told you that there was something that spoke to you every night, that always presented you with a truth about your own life and soul, that was tailor-made to your individual needs and particular life-story, and that offered to guide you throughout your lifetime, and connect you with a source of wisdom far beyond yourself. And, furthermore, suppose that all of this was absolutely free. Naturally you would be astonished that something like this existed. Yet this is exactly the way it is with our dreams.
The interpretation of dreams is the royal road to a knowledge of the unconscious activities of the mind.