Who said "I had not known how much grief could exist in silence."?

This quote is attributed to Genly Ai.

I had not known how much grief could exist in silence. - Genly Ai

"I had not known how much grief could exist in silence."

Genly Ai

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."