Faith had seen how Daniel used his light to purify the wine and guessed the nature of his individuality.
That had been quite easy for her since her individuality used to have similar features. Her peace was something that she enforced by keeping away anything that could disrupt it. Yet, her foundation would have been empty if she had continued to pursue that path.
The opposite would happen to Daniel if he kept on pursuing his endless purification. His individuality would just become nothing at some point.
Daniel's eyes widened at her words. He understood what she was saying, and he managed to spot a fatal flaw on his path thanks to the insights gained in that short conversation.
"I need to preserve a core that I can't afford to lose," Daniel said as he turned his head to stare at the wall. "That is what I have to purify to its apex. My willpower must reach a new form."