We must be extremely aware that the power of the five sensory systems is strong enough to lead one down a path towards adopting a life filled with mindful actions. Cultivating the strength to overcome this highly invasive and destructive force of the Mind is indeed the strength of one's Ordinary Mind. The evils of ignorance, contempt and disrespect, so viciously portrayed by the Mara King, were all overcome by the Mind of Gautama Buddha. The power to overcome such an evil Mind is epitomized by the Buddha Form on the Moon. Figuratively speaking, the beastly nature of Mara depicted in the Bhavachakra shows how the evil Mind could forcibly occupy one's Mind with thoughts of viciousness and guile.
Clarity is what we can all see in our conscious Mind. There can be no clarity whatsoever in a dream. As vivid as a dream can be, there is no means to clarify the details in that dream in order to bring clarity. How can one perceive then, what clarity means? The power to eliminate the fog, and to experience with greater clarity what lies ahead in our path, strikes at the heart of the Heart Sutra.