Who said "Change is hard, but sometimes it's necessary"?

This quote is attributed to Kenny McCormick.

Change is hard, but sometimes it's necessary - Kenny McCormick

"Change is hard, but sometimes it's necessary"

Kenny McCormick Change

"Mmph mmph mrmph!"

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

"Dude, we're in third grade"

"This is so cool"

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."