Who said "I'm at peace with who I am."?

This quote is attributed to George Costanza.

I'm at peace with who I am. - George Costanza

"I'm at peace with who I am."

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."