Who said "The most important thing is to keep your head held high."?

This quote is attributed to Snoopy.

The most important thing is to keep your head held high. - Snoopy

"The most important thing is to keep your head held high."

Snoopy Courage

"I think I'm dying. Send for a doctor immediately!"

"Rats! Another day, another disappointment."

"Sometimes I lie awake at night and ask, 'Is life a multiple choice test or an essay?' Then a dog barks and I realize it doesn't matter."

"I love mankind. It's people I can't stand."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."