Who said "To be wholly alien is perhaps the deepest loneliness."?

This quote is attributed to Genly Ai.

To be wholly alien is perhaps the deepest loneliness. - Genly Ai

"To be wholly alien is perhaps the deepest loneliness."

Genly Ai Solitude

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."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."