Just this Doubleness is needed in the progressive economic life.
"Psychology and Social Sanity"
Hugo Münsterberg
So she was a Countess born, which accounted for the Doubleness.
"In the Courts of Memory 1858-1875."
L. de Hegermann-Lindencrone
His curious, analytic observation, his way of looking at the soul from outside, gives a Doubleness to the monologues in his Dramatic Lyrics, 1845, Men and Women, 1855, Dramatis Personae, 1864, and other collections of the kind.
"Brief History of English and American Literature"
Henry A. Beers