Who said "Only a fool makes threats he's not prepared to carry out"?

This quote is attributed to Tyrion Lannister.

Only a fool makes threats he's not prepared to carry out - Tyrion Lannister

"Only a fool makes threats he's not prepared to carry out"

Tyrion Lannister Wisdom

Character in A Game of Thrones

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"A man's got to know his limitations."

"The gods flip a coin."

"That's what I do. I drink and I know things."

"Lannister always pays their debts."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."