Who said "Give gratitude only to your Dalek masters."?

This quote is attributed to Dalek.

Give gratitude only to your Dalek masters. - Dalek

"Give gratitude only to your Dalek masters."

Dalek Gratitude

"Exterminate! Exterminate!"

"You will be exterminated!"

"Daleks do not feel pity or remorse or fear."

"We are superior. We are pure."

"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"