This is one of the mantra
s I use to get through bad day
s. The idea is that, if tomorrow is worse than today, then I'd better do what I have to do today, while I am feeling good. (I hope that makes sense).
I have found that people with chronic pain, like myself, have a tendency to develop many mantras, in order to convince themselves that the pain really isn't that bad.
It's an interesting phenomenon; that people in pain use little pieces of language in much the same way pro athletes do. Does the power of a mantra come from the words themselves or the repetition?
Personally, I have neurally mediated hypotension, which in turn creates chronic migraine headaches, which then creates other problems. In my experience, little motivators like the one mentioned above are usually as effective as any drug.