This is written above the stage at the Royal Theatre, and translates to 'not just for pleasure', meaning that it should also offer culture, education. Tonight's showing of Mozart's early and lesser known opera 'Lucio Silla' gives the phrase a whole new meaning. If you are ever given the chance to see this opera with a minimalist set, where the performers dress in plain grey suits, and in those suits sing about intrigue in the Roman empire, if you have that chance, don't take it. Just don't.
On the other hand, it's always good to hang out in the Royal Theatre, because there's so much in the theatre itself to look at when one is bored.