Serge Lang, Collected Papers, Vol. 4 , p. 179—

"I find it appropriate to quote here a historical
comment made by Halberstam…."

This is Heini Halberstam, who reportedly died
on January 25, 2014.

I find it appropriate to quote here an unhistorical
comment made by a fictional character —

“The test?” I faltered, staring at the thing.

“Yes, to determine whether you can live
in the fourth dimension or only die in it.”

— From Fritz Leiber's classic story
    "Damnation Morning"

The Leiber quote was suggested by the posts
in this journal on the day of Halberstam's death.