Who said "Perseverance is just refusing to give up on yourself."?

This quote is attributed to Butters Stotch.

Perseverance is just refusing to give up on yourself. - Butters Stotch

"Perseverance is just refusing to give up on yourself."

Butters Stotch Perseverance

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

"Aw, hamburgers!"

"You're grounded, mister!"

"I have to go do my chores now"

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."