The universe exists because you exist. Without your existence universe ceases to exist. Thus your existence is important for the existence of the universe. You exist, because the universe exists. Thus existence of the universe is necessary for your existence because you exist within the universe. Thus you and the universe co-exist together. Thus it is necessary to know, how the universe which contains everything exists, not the things bifurcated by form and names within the universe.
Whatever Plants, animals, people, planets, stars, and ocean mountains everything, which is seen, known and believed and experienced as person are within the universe. The universe appears when the mind (I) appears and universe disappears when the mind (I) disappears. Thus, it is necessary to realize the mind is in the form of universe, which appears as waking or dream and disappears as deep sleep.
Mind is universe, because when the mind (I) is there then only the universe is there. The ego, body, universe appear together and disappear to gather. Limiting the mind (I) to the physical entity is cause of the ignorance. The body, ego, universe ceases to exist without the mind. If one of these is absent then the mind is also absent. Thus mind is the whole universe, which appears as waking or dream(duality) and disappears as deep sleep(non-duality) Thus one which is aware of the appearance and disappearance of dual and non-dual experiences is not the form( mind or universe) but formless(consciousness).
The consciousness (soul) is the true self. The true self is the source of the three states. These three states deceive; the people fail to look beyond them to its source, which is real, supreme and imperishable. The three states are mere mirage/illusion. It is difficult to overcome the illusion without the wisdom. But one can cross over this illusion, by realizing and becoming aware of the fact that, the self is not physical but it is consciousness.
People are deluded by illusion, because they have immersed in the illusion experiencing it as reality. They are ignorant because they think the self is physical and birth, life, death and world as reality. Having lost all discrimination, they follow the way of their physical nature. When ignorance vanishes through wisdom then only it is possible to negate the illusion, the mortal becomes immortal. When all the physical shackles that strangle the self are loosened, the mortal becomes immortal, here in this very life.
The ultimate understanding is: Nothing has actually been created. All that appears is mere mirage. Everything is consciousness and nothing can be a part of it. No second thing exist other than consciousness, neither the man nor the world, which contains all the objects exits in non-dual reality.