Just for today I will be happy. This assumes what Abraham Lincoln said is true: 'Most folks are about as happy as they make their mind up to be.' Happiness comes from within; it is not a matter of externals.
Just for today I will try to adjust myself to what is; not try to adjust everything to my own desires. I will take my family, my business, and my luck as they come and fit myself to them.
Just for today I will take care of my body. I will exercise it, care for it, nourish it, not abuse or neglect it, so that it will be a perfect machine for my bidding.
Just for today I will try to strengthen my mind. I will learn something useful. I will not be a mental loafer. I will read something that requires effort, thought, and concentration.
Let's see what the other 6 are:
http://www.motivateus.com/stories/jft.htm