Who said "I think friendship is the most important thing there is."?

This quote is attributed to Butters Stotch.

I think friendship is the most important thing there is. - Butters Stotch

"I think friendship is the most important thing there is."

Butters Stotch Friendship

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

"Aw, hamburgers!"

"You're grounded, mister!"

"I have to go do my chores now"

"Friendship is built on trust and honesty."

"True friendship is worth more than gold."

"Good friends are like stars, always there even when you can't see them."

"Friendship means sacrifice."