The mind is the set of faculties responsible for mental phenomena. Often the term is also identified with the phenomena themselves. These faculties include thought, imagination, memory, will and sensation.

What does the expression mind yourself mean?

So "mind yourself" means to mind/watch what you're saying/doing. For example if someone's about to trip over something, you might warn, "Mind yourself." Or if someone is rude/says a bad word, you might say, "Mind your language," or, "Mind yourself."

What does it mean when someone minds you?

A phrase used to indicate that someone must consider or pay attention to a particular piece of information. They are expensive, mind you, but the quality of their craftsmanship is worth the extra price. They can certainly afford to give some of their profits back to their employees, mind you.