Who said "Change is the only constant in life."?

This quote is attributed to Cosmo Kramer.

Change is the only constant in life. - Cosmo Kramer

"Change is the only constant in life."

Cosmo Kramer Change

"Giddy up!"

"These pretzels are making me thirsty."

"I'm out there Jerry, and I'm loving every minute of it."

"It's not a lie if you believe it."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."