Fran indeed enjoys the pursuit of the unknown, but he has always set a boundary for himself.
He never agreed with the approach that as long as it was for the pursuit of knowledge, one could abandon the boundaries of being human. After leaving Teraxil, this belief became even more firm.
Fran even feels that he is stronger now for being willing to give up the knowledge of the evil side than he was in the past when he wanted to learn everything.
This realization was brought to him by Hill: choose the path you want, and then persist in it without hesitation. Even if other sceneries are more beautiful, do not feel regret.
Never let your persistent exploration of knowledge turn into uncontrollable greed.
He glanced at his grandson, who was looking at him with concern, and smiled slightly: "Don't worry about me.