Who said "Just keep digging, that's all you can do."?

This quote is attributed to Janis Joplin.

Just keep digging, that's all you can do. - Janis Joplin

"Just keep digging, that's all you can do."

Janis Joplin Perseverance

Rock Blues Singer American 1943–1970

"Don't compromise yourself. You're all you've got."

"Being an intellectual creates a lot of questions and no answers."

"Catch a fire and you'll never be the same."

"Try just a little bit harder to be a little bit better."

"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."