Who said "Patience is the hardest thing to learn."?

This quote is attributed to Kenny McCormick.

Patience is the hardest thing to learn. - Kenny McCormick

"Patience is the hardest thing to learn."

Kenny McCormick Patience

"Mmph mmph mrmph!"

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

"Dude, we're in third grade"

"This is so cool"

"Patience is a virtue I'm still learning."

"I may be a redhead, but I'm not a hothead."

"Patience is a virtue."

"Patience is a virtue I never learned."