They say 'If it ain't broke, don't fix it.' But what should we do if we're not sure whether something is broken or not? Our efforts to test it may break it; as may our efforts to fix it! Yet it can't be good to remain uncertain about a situation or an arrangement. To an extent, something becomes 'broken' the moment we start to fear that it may be broken. That's one reason to keep faith in what we need to rely on.