Who said "What is kept must be lost, what is kept must be seized"?

This quote is attributed to Estraven.

What is kept must be lost, what is kept must be seized - Estraven

"What is kept must be lost, what is kept must be seized"

Estraven Philosophy

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've seen the worst humanity has to offer."

"Sometimes I wonder if the world is worth saving."

"Every choice shapes our destiny."

"Order is the foundation of a good life."