“You are so brave and quiet I forget you are suffering.”

"A Way to Love God", New and Selected Poems 1923–1985 (1985)
Context: I cannot recall what I started to tell you, but at least
I can say how night-long I have lain under the stars and
Heard mountains moan in their sleep. By daylight,
They remember nothing, and go about their lawful occasions
Of not going anywhere except in slow disintegration. At night
They remember, however, that there is something they cannot remember.
So moan. Their's is the perfected pain of conscience that
Of forgetting the crime, and I hope you have not suffered it. I have.

Exiles (1915), Act II http://www.robotwisdom.com/jaj/exiles2.html

Source: Girl with a Pearl Earring

Source: Letters to Felice‎

Peter Camenzind (1904)

Variant: Will-"
"I love you so much, so incredibly much," he went on, "and when you're this close to me, I forget who you are. I forget you're Jem's. I'd have to be the worst sort of person to think what I'm thinking right now. But I am thinking it.
Source: Clockwork Princess

Source: The Lone Ranger and Tonto Fistfight in Heaven

Source: Farmer in the Sky (1950), Chapter 13, “Johnny Appleseed” (p. 131)