Who said "I think we can do better"?

This quote is attributed to Butters Stotch.

I think we can do better - Butters Stotch

"I think we can do better"

Butters Stotch Motivation

"I'm not bad, I'm just drawn that way"

"Aw, hamburgers!"

"You're grounded, mister!"

"I have to go do my chores now"

"I believe in working hard for what you want."

"Never underestimate the power of determination."

"I don't need a reason to fight."

"The most important thing is the mission. Nothing else matters."