It is always the way that if you want something to be there for you, come the time when it is needed, you practice putting it there in advance.
It is always the way, that if a slave tries ever so hard to finish his task, and tires himself almost to death, he is sure to get a whipping if he leaves only a little piece, ...
it is always the way that batteries die when it is most inconvenient...
Porównaj z tym jak ty tego użyłeś.