Until tomorrow comes, today is the day that should be concentrated on. Too many lives are spent thinking and planning for "tomorrow". Consider that the focus of the mind on a future event wipes away the focus on that which is meant for 'today'. It is not that it is not a good idea to plan ahead, but that it is best to be careful that the days you are spending are not diminished because of the interest in the future. There is a good balance between being too farsighted and too shortsighted. Check occasionally and see where your focus is and if it is too far away, bring it back to today.