What lessons have you learned lately?
When something doesn’t go the way you think it should do you learn from the experience or do you just get upset and think you can’t do it?
This reminds me of another quote by Henry Ford, he said "Whether you think you can, or can’t, you’re right". So remember to learn from the past.
But also remember, if yesterday was a bad day today doesn’t have to be. That is what today’s quote is saying live for today. When you get up in the morning ask yourself "how can I make today great" or something along those lines and you should have a good day.
Hope for tomorrow to be better than today, or hope that you will get a surprise. Tomorrow is like Christmas morning you never know what it will bring, so there is always hope.