As we get older – more mature as my father likes to put it – our physical capacity diminishes. That is why it is so important that we steward well the resources we have been given by God. He gave them to us for a particular purpose. As my friend Dave Jewitt likes to say, one of the reasons we face diminished capacity as we mature is so we will function in the purpose for which God uniquely and sovereignly designed us.
Just doing the normal Christian stuff is not our ultimate purpose. We need to be about that for which he designed us.