Who said "The man who fears losing has already lost."?

This quote is attributed to Stannis Baratheon.

The man who fears losing has already lost. - Stannis Baratheon

"The man who fears losing has already lost."

Stannis Baratheon Courage

Character in A Clash of Kings

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"A man without honor is no man at all"

"In the wars to come, I need men of courage."

"A man should know why he fights."

"The throne is not a gift, it must be seized"

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."