Of course, he could choose not to cut away those scattered insights. He would still be in the Daluo Realm, but he would be much weaker. That was the main reason cultivators in the same realm could differ so greatly in strength.
Cultivation had an interesting twist: Great Luo emphasized refining one's Great Dao until it was pure enough to form a Dao Fruit. But after reaching Quasi-Saint, one sought a wider range of insights, drawing on other paths to strengthen one's own.
In any case, clearing away stray thoughts and muddled insights was difficult. Once someone had gone down the wrong path, finding the way back was harder still.
Yet the Origin of All Evil could devour stray thoughts. It was a powerful aid to cultivation. Who would have thought the Origin of All Evil, used to form an Evil Corpse, could do that?
At Ren's current level, stray thoughts would not cloud his comprehension of the Great Dao. And the Reincarnation Great Dao he cultivated could encompass any system, so he had no need to worry about such things. Even so, that ability made the Origin of All Evil a remarkable tool.
As Ren pondered, the Demon Empress gazed at him with appreciation and smiled. "Haha... Boy, you're underestimating the Origin of All Evil. It grew from the lingering thoughts of a Chaos Demon God, then my true self refined it. How could it be so simple? With a high enough realm and enough fortune, one could use it to seek out a Demon God Origin, transform one's body, and set foot on the Chaos Dao. Unfortunately, the four who relied on the Origin of All Evil only reached Half-Step Primordial Unity and could advance no further. Perhaps they might have done so someday, but they're all dead.