Who said "I may be a dreamer, but my dreams keep me alive."?

This quote is attributed to Snoopy.

I may be a dreamer, but my dreams keep me alive. - Snoopy

"I may be a dreamer, but my dreams keep me alive."

Snoopy Dreams

"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."

"This is going to be a great show!"

"Dreams are what make life worth living."

"Never stop dreaming big."

"Dreams are what keep us going."