"Mind Joy" does not appear to be a widely recognized or commonly known term or concept. It is possible that the term may have emerged or gained popularity , or it could be a term specific to a certain context or community.
Without further context, it is challenging to provide a specific definition or explanation of "Mind Joy." It could be a term used in psychology, self-help, spirituality, or another field. If you could provide more information or context about where you came across this term, I may be able to offer a more accurate response.