There is a kind of tiredness that does not announce itself.
We are usually alert to the obvious dangers. But something quieter can happen to those of us who have been serving for a while, and it rarely arrives as a crisis.
You still believe in God. You still believe Jesus is Lord. You still believe He called you. You still turn up, still serve, still lead, still give. Nothing on the outside has changed at all.
But somewhere, because of disappointment, or waiting, or plain tiredness, the expectation you once carried has grown a little thinner. The prayer you once prayed with tears has become something you simply say.
Scripture has a word for this, and it is more serious than we tend to think.