The so-called human heart cannot be tested.
No matter how incorruptible a person may seem, faced with an unattended treasury full of gold and silver, perhaps a trace of errant thought would arise occasionally.
If even gold and silver, seen as mere dirt, can tempt, what about the immortality coveted by deities and Immortal Venerables?
Imposing Emperor's Aura is like that treasury of gold and silver, faced daily by the Human Emperor, who only has to reach out to seize that transcendence beyond the Dao.
Yet he merely remains intoxicated day after day, never stepping away, and has never reached out his hand.
This is a form of torture with no end in sight.