Kūkai learned of the Mahāvairocana Tantra in 796, and travelled to China in 804 to receive instruction in it.
The following outline is based on Hodge's translation of the Tibetan version of the Sutra. The Chinese version has differences in the order of the chapters.
Yet ultimately even emptiness needs to be transcended, to the extent that it is not a vacuous emptiness, but the expanse of the mind of Buddha, Buddhic Awareness and Buddha-realms, all of which know of no beginning and no arising - as Stephen Hodge points out:
The sutra later reinforces the notion that Emptiness is not mere inert nothingness but is precisely the unlocalised locus where Vairocana resides. Vajrapani salutes the Buddha Vairocana with the following words:
Emptiness in Buddhist discourse usually means the flow of causation and result - the arising of causes and conditions - but in this scripture, Mahavairocana Buddha declares himself to be separate from all causes and conditions and without defect - truly mighty: