When the self is formless, then there is no scope for all the thoughts, emotions, feeling perception greed, jealousy pain and pleasure which exist only when form is considered as self. In formless [true] existence there is no scope for human attributes because the self is attribute-less.
The self is beyond thoughts because the physical existence is created out of the single stuff. Therefore the diversity has no place in reality.
One becomes limited to the concepts, names and forms within the waking or dream (mind or universe) . Waking or dream (mind or universe) originates from the soul. The soul is in the form of consciousness is the innermost self. Realizing the soul as the true self is truth realization. Soul is limitless, permanent and unchanging, and by its nature is formless, non-dual and universal. The soul witnesses the coming and going of the three states. On the standpoint of soul of self (formless witness) the three states are mere illusion because the witness [formless soul) and witnessed (three states) are one in essence. The essence is soul or consciousness. Thus, there is no second thing exists other than consciousness. Hence it is nondual. Thus consciousness is the ultimate truth or Brahman