Who said "Mercy is for those who lack the will to act."?

This quote is attributed to Darth Maul.

Mercy is for those who lack the will to act. - Darth Maul

"Mercy is for those who lack the will to act."

Darth Maul Courage

"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."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."