Who said "The darkness we fear is often the darkness within"?

This quote is attributed to Therem Harth rem ir Estraven.

The darkness we fear is often the darkness within - Therem Harth rem ir Estraven

"The darkness we fear is often the darkness within"

Therem Harth rem ir Estraven Fear

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"

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."