The whole point to adult Christian life is service. Really. If you are a Christian adult, and you are not serving anyone, then what on earth are you doing? And how can you be happy?
I was talking to my pal Andrew yesterday, and he mentioned that although one would think that service would feel like a downer, it really feels like a great privilege.
I think it is that feeling that tells you you are in the right form of service! It has to be a free gift, so if you are already in a service profession, I guess it might be when you go the extra mile, or perhaps when someone great thanks you with real gratitude for what you do.
Sometimes, of course, you are not really in a position to serve in active ways, like elderly and infirm Jesuits who give up their last professional duties with a sigh and say that now their service is to pray for the Society. But doubling your prayers because you no longer have another service to gives is service too.