Who said "The Sith have waited a thousand years for this moment."?

This quote is attributed to Palpatine.

The Sith have waited a thousand years for this moment. - Palpatine

"The Sith have waited a thousand years for this moment."

Palpatine Patience

"Did you ever hear the tragedy of Darth Plagueis the Wise?"

"The dark side of the Force is a pathway to many abilities some consider to be unnatural."

"Have you ever heard of the tragedy of Darth Plagueis? I thought not."

"Unlimited power!"

"Patience is a virtue I'm still learning."

"I may be a redhead, but I'm not a hothead."

"Patience is a virtue."

"Patience is a virtue I never learned."