The words "joy" and "gladness" mean the same thing and are used to emphasize how great the joy will be. AT: "you will have great joy" or "you will be very glad" (See: [[rc://en/ta/man/translate/figs-doublet]])
This can be stated in active form. AT: "the Holy Spirit will empower him" or "the Holy Spirit will guide him." Make sure it does not sound similar to what an evil spirit might do to a person. (See: [[rc://en/ta/man/translate/figs-activepassive]])