Who said "I believe in being honest, even when honesty is hard."?

This quote is attributed to Butters Stotch.

I believe in being honest, even when honesty is hard. - Butters Stotch

"I believe in being honest, even when honesty is hard."

Butters Stotch Truth

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

"Aw, hamburgers!"

"You're grounded, mister!"

"I have to go do my chores now"

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."