Who said "The grace of courtesy costs nothing but is priceless."?

This quote is attributed to Margaery Tyrell.

The grace of courtesy costs nothing but is priceless. - Margaery Tyrell

"The grace of courtesy costs nothing but is priceless."

Margaery Tyrell Kindness

"A woman's greatest weapon is the ability to make men want to please her."

"I do love the people of the Reach, truly I do."

"The rose has thorns as well as beauty."

"Every woman wants to be a queen in her own right."

"A good man treats his wife with respect."

"Kindness always comes back around."

"The power of a smile can change everything."

"Kindness is weakness to some. Not to me."