Who said "The key is to never give up."?

This quote is attributed to Cosmo Kramer.

The key is to never give up. - Cosmo Kramer

"The key is to never give up."

Cosmo Kramer Perseverance

"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."

"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."