In colonial America, the phrase "Mind your business," as used on the Fugio Cent (the first coinage authorized by the federal government of the US), meant get to work. Coupled with the word Fugio ("I fly") and a picture of a sundial on the other side of the coin, this was an admonition from Ben Franklin to citizens of the new nation to get busy -- they had a country to build.
From a discussion at Collector's Universe:
Mind Your Business was only half of the legend. The other part -- Fugio -- would have been understandable to most folks in the 18th century, even though it was latin. Fugio means "I fly," referring to the sundial, representing time.
So the full legend is [Time] flies, [so] mind your business.
Or, The clock is ticking, go do what you need to do.