Yesterday is gone. You cannot change anything about it. You can try to make up for errors or remember good actions, yet whatever happened there stays there.
Tomorrow is too far out of reach. You can plan; you cannot complete those tasks today, not if they will not happen until the future.
Today is the here and now. Now you can stand up and do something. Today you can change yourself and the world. Today you can make and be the difference. Remember, you can do this only if you get up, go out, and do so.
Today is the day. What will you go out and do that is good?