The means by which he erased his own emotions were none other than the powers Liens currently possessed—Heaven and Man as One and Sword Heart.
'Heaven and Man as One' granted him control over heaven and earth, much like the will of the Heavenly True Path.
However, because he was too close to heaven and earth themselves, as he influenced them, they also exerted their influence on him.
As for 'Sword Heart,' it allowed him to refine The will of all people, and the only price was to endure the emotional impact transmitted by The will of all people, like countless people whispering in his ear.
These two costs: one would make a person absolutely rational, and the other would make a person go mad.
It was precisely because of these two almost conflicting influences that he found a balance between them, which was his current state of suppressed emotions.
