Who said "A man cannot serve two masters."?

This quote is attributed to Kaladin Stormblessed.

A man cannot serve two masters. - Kaladin Stormblessed

"A man cannot serve two masters."

Kaladin Stormblessed

Character in The Way of Kings

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"A man can change his own future."

"I will protect those who cannot protect themselves."

"What if I'm stronger than I think I am?"

"They are like traders of emotion."