Mind your own business or you will undermine your own business.

The best kind of mind is that which minds its own business.

There is no mother like your own mother.

He that is cruel to his own will not be cruel to others.

There are two reasons why some people don’t mind their own business. One is that they have no mind, and the other is that they have no business.

Time spent in minding other people’s business is about the greatest waste of time there is.