Who said "Your greatest strength is your ability to keep trying."?

This quote is attributed to Butters Stotch.

Your greatest strength is your ability to keep trying. - Butters Stotch

"Your greatest strength is your ability to keep trying."

Butters Stotch Strength

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

"Aw, hamburgers!"

"You're grounded, mister!"

"I have to go do my chores now"

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."