Who said "To love is to be vulnerable."?

This quote is attributed to Estraven.

To love is to be vulnerable. - Estraven

"To love is to be vulnerable."

Estraven Love

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."

"I love my wife, but sometimes she drives me crazy."

"Love conquers all obstacles."

"Love is patient, love is kind."

"I'm not stupid, I'm just in love!"