Who said "Two become one, and one becomes two"?

This quote is attributed to Estraven.

Two become one, and one becomes two - Estraven

"Two become one, and one becomes two"

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!"