Who said "The test of a civilization is how it treats the stranger"?

This quote is attributed to Genly Ai.

The test of a civilization is how it treats the stranger - Genly Ai

"The test of a civilization is how it treats the stranger"

Genly Ai Justice

Character in The Left Hand of Darkness

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"A frozen world is nothing to a man who knows the heat."

"How could you trust something that could become the opposite sex at any moment?"

"I do not know how to explain to you the extreme sense of isolation I feel."

"I had been afraid of the wrong thing, all along."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."