Who said "You must always give your best to whatever you're doing."?

This quote is attributed to Harry Truman.

You must always give your best to whatever you're doing. - Harry Truman

"You must always give your best to whatever you're doing."

Harry Truman Work

U.S. President American 1884–1972

"The buck stops here."

"If you can't stand the heat, get out of the kitchen."

"I never give them hell. I just tell the truth, and they think it is hell."

"A politician is a fellow who will lay down your life for his country."

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."