Giyu: holding Nezuko in one hand She won't get better. A human who became a demon cannot go back.

Tanjiro: i'll find a way! I swear! Please don't kill her! I'll also find the one who killed my family! I'll do all that so...so...

Giyu: prepares katana

Tanjiro: kneels down, bows head please, stop. Please don't kill my little sister. Please...please...

Giyu: Never leave yourself so defenseless in front of an enemy! Stop bowing so pitifully! If that worked, your family would still be alive!

How can a weakling like you, who bows when it's time to fight, to kill or be killed, how can a such a man cure his little sister? Or even find his enemy?!

If you want something, fight for it! The meek have no power or options! The strong will just crush them in every single way!

Demons might know how to cure your little sister, but no demon will respect your whining or begging! And for that I don't respect you either!

Earlier, why did you cover your sister? Did you think that would protect her?! Why didn't you throw your hatchet?! Why did you show me your back?! That's how I was able to get her! I should've skewered you both!

*Don't cry. Don't despair. Those things will do you no good. Your family is dead and you little sister has become a demon. Your heart is crushed.

I know your pain, how you must want to cry out. If I'd come half a day sooner, your family might have survived. But there is no turning back time.

Fill your heart with anger. Strong pure anger that gives no quarter. Anger that becomes the unwavering force that drives your limbs.

Weakness and empty promises cannot protect your sister or find her cure. And they certainly cannot avenge your family.*