Professor William Graham Sumner :'Mind Your Own Business. It is nothing but the doctrine of liberty.'

Professor William Graham Sumner :

Society needs first of all to be freed from these meddlers — that is, to be let alone. Here we are, then, once more back at the old doctrine — laissez faire. Let us translate it into blunt English, and it will read, Mind your own business. It is nothing but the doctrine of liberty. Let every man be happy in his own way. If his sphere of action and interest impinges on that of any other man, there will have to be compromise and adjustment. Wait for the occasion.

You'll want to read the entire book.