I've always heard the saying that "How could we know happiness if we didn't know pain?" I don't think that's exactly true.
When I was about six, whilst I was in school I had one of my favourite books stolen, another book vandalised, a teddy stolen and was constantly humiliated in front of my class by my art teacher. Mostly though, I was ignored by the others. Of course, other things happened too but I just wanted to put down some favourites from that year.
I had my happy moments as well, as all children do. They probably were more happy because of all the things that happened to me. But I think I still would've been happy even if Teddy didn't get stolen and if I ever got to finish Winnie the Pooh.
However, in the case of arthritis, the saying is extremely true. You don't know the joy of being capable of walking a mile easily until that mile becomes a painful challenge that is practically impossible. You don't know the satisfaction of being able to finish a coloured pencil portrait until your hands are too painful to properly grip the pencil. The relief a medicine gives might feel like Heaven after a battle with side effects from introducing it.
I guess most things in life 'Just Depend.'