Who said "A man who cannot be alone cannot be with anyone"?

This quote is attributed to Therem Harth rem ir Estraven.

A man who cannot be alone cannot be with anyone - Therem Harth rem ir Estraven

"A man who cannot be alone cannot be with anyone"

Therem Harth rem ir Estraven Solitude

Character in The Left Hand of Darkness

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"Light is the left hand of darkness"

"A man who won't work cannot love, and a man who won't love is a man who won't work"

"You cannot buy the wind"

"Shame is a barrier to love"

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."