Who said "The bond forged in ice is stronger than metal"?

This quote is attributed to Estraven.

The bond forged in ice is stronger than metal - Estraven

"The bond forged in ice is stronger than metal"

Estraven Strength

Character in The Left Hand of Darkness

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"One cannot simply walk away from one's kethil."

"Winter is the time for stories, not for traveling."

"Forsivin! I had no forgiveness coming."

"Love is a country where borders are dreams."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."