I've done all I can do. - George Costanza

"I've done all I can do."

George Costanza Perseverance

More from George Costanza

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

"These pretzels are making me thirsty."

"Master of my domain."

"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."