I've convinced her that all humans are her family... I told her to protect them... and if a demon harms a human ... do not ever forgive them!

"Your sister must never take the life of an innocent person!

"Tanjiro... when I think about it, ever since you brought your younger sister, who had become a demon I've felt as thought large cogs have been turning. If this war is a giant machine then when the two cogs that are you and Nezuko fitted into place, it caused a stagnant situation to suddenly begin moving. Don't lose, Nezuko. Don't lose, Tanjiro. You must not lose.