The Human Race was the protagonist of heaven and earth, the result of the evolution and the balance of power among the mighty.
Amongst everything under heaven, only the Human Race was innately weak; even with their vast numbers and flourishing beings, they could hardly pose a threat to the entirety of the Three Realms.
Furthermore, the Human Race's Incense and Devotion Power could help the strong enhance their strength, making those powerful beings even more reluctant to lose such a means of empowerment.
Look at how indifferent they seem on the surface, but if someone were truly to sever their faith, to take away all their Incense Visitors, they would certainly fight to the death.
Therefore, the Human Race, being central to the Heavenly Emperor, was naturally hard to shake.
Humans fight for their dignity just as Buddhas vie for a single stick of incense—this is not said in jest.