Who said "We are slaves to duty."?

This quote is attributed to Jon Snow.

We are slaves to duty. - Jon Snow

"We are slaves to duty."

Jon Snow

Character in A Clash of Kings

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"A man of the Night's Watch does not father children."

"There is no shame in fear, only in surrendering to it."

"I am bound to the world of men and duty."

"The night gathers, and now my watch begins"