Who said "Gratitude for what you have keeps you grounded."?

This quote is attributed to Arrow.

Gratitude for what you have keeps you grounded. - Arrow

"Gratitude for what you have keeps you grounded."

Arrow Gratitude

"My name is Oliver Queen. After five years in hell, I have come home with only one goal: to save my city."

"I'm not the man I was."

"You have failed this city."

"I'm a monster."

"Gratitude makes life richer."

"A grateful heart is a happy heart."

"Respect those who came before us."

"Life's greatest treasures are the people we love"