Appreciate today. Appreciate life. If it's a fleeting moment in which you can appreciate the world around you, then so be it. At least it's something.
Don't let external factors bring you down. There is always something to appreciate in this life. Whether it be the beauty of a sunny day, spending time laughing with family, or talking for hours to a good friend, there is something to appreciate today.
Look for it. Find it. Embrace it.
Sometimes it's just a matter of realizing that there is some good floating around you. Open your eyes. Accept the bad, but don't forget about the good.
Appreciate today. You only get to live today once.