Residing within this universe will not allow full exposure to Ahadiyat where/when/how/what there is Allah and no one else. Therefore human being needs to voyage to another realm to be able to observe such form of Tauhid (Divine Oneness).
That voyage is impossible, unless by the endowment of a singularity i.e. “I”, voyage through which the laws and constraints of this corporeal universe vanish and the spiritual realm of Ahadiyat made observable (Shuhud), human existence evanesced and as such human being and cosmos become one and the same entity due to close proximity to Absolute Oneness of Ahadiyat.
In that modality of existence the human being is a universe all to himself(herself) and far larger than the cosmos, best coined as “I”.
Lahiji therefore concludes: Know that Insan (Human Being) is chosen to be the transcription of all universes, both corporeal and spiritual, all emerge within his genesis.