Who said "Gratitude is a luxury the strong cannot afford."?

This quote is attributed to Darth Maul.

Gratitude is a luxury the strong cannot afford. - Darth Maul

"Gratitude is a luxury the strong cannot afford."

Darth Maul Gratitude

"At last we will reveal ourselves to the Jedi. At last we will have revenge."

"The suffering you feel now will forge you into something greater."

"Patience is the weapon of the truly powerful."

"I am darkness given form, and I hunger for your destruction."

"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"