Now, we know that parables only carry one message – and that traditionally this is interpreted as a message about acceptance into God’s Kingdom regardless of the time we have been committed; but the behaviour of those who are there early really struck us – why would they be complaining? Surely living in the Kingdom now is about life in all its fulness?
I recall a bishop once saying if it isn’t fun why not give up and do something else?
Perhaps not fun, but if faith isn’t fulfilling why continue? If you are miserable about your faith now, do you really want the reward of living that way for all eternity?