Who said "Your kindness will be remembered as your final mistake."?

This quote is attributed to Dalek.

Your kindness will be remembered as your final mistake. - Dalek

"Your kindness will be remembered as your final mistake."

Dalek Kindness

"Exterminate! Exterminate!"

"You will be exterminated!"

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

"We are superior. We are pure."

"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."