"You have forgotten the face of your father!" Literary origins of this phrase?

I found this line, used frequently in Stephen King’s “Dark Tower” series to be rather memorable. At the least, its implication that one had lost his moral compass, was quite striking.

I’m curious to learn of the origins & earlier uses of this phrase.

I don’t think there are any earlier uses of the phrase. Every reference to it I’ve found relates back to Roland.

That was my experience too, but I must admit I’ll be surprised if it originated with King (as much as I enjoy his writings, I always felt he wasn’t quite that original).

I’ll love it if I’m proved wrong.

King has had occational moments of greatness.

“Longer than you think, Dad! Longer than you think!” still gives me the chills.