Who said "The only failure is giving up before you've really tried."?

This quote is attributed to Heckle and Jeckle.

The only failure is giving up before you've really tried. - Heckle and Jeckle

"The only failure is giving up before you've really tried."

Heckle and Jeckle Perseverance

"Why be serious when you can be hilarious?"

"Life's too short to not laugh at yourself."

"A good prank shared is a friendship earned."

"Sometimes the best wisdom comes wrapped in a joke."

"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."