But the evidence of his pain was too indisputable.

There was no shutting it out.

It sounded loud in his voice, it showed in his looks.
His face had grown white and haggard, the face of a tortured man; his hands trembled, his eyes were fierce with longing.
"Oh, don't," she cried, and so great was her trouble that for once she did not choose her words.

"You know that it's impossible.

We can't alter these things." She meant by "these things" the natural law that white shall mate with white, and brown with brown; and so Shere Ali understood her.