Who said "Never give up, even when odds are impossible."?

This quote is attributed to Kenny McCormick.

Never give up, even when odds are impossible. - Kenny McCormick

"Never give up, even when odds are impossible."

Kenny McCormick Perseverance

"Mmph mmph mrmph!"

"I'm not fat, I'm just big boned"

"Dude, we're in third grade"

"This is so cool"

"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."