Learn from the past, set vivid, detailed goals for the future, and live in the only moment of time over which you have any control: now. – Denis Waitley
You can’t live in the past, you can only learn for it. You also can’t live in the future, you can only plan for it. If you’re smart, you’ll take what you’ve learned from the past and apply it to your future. But don’t get too hung up on what was, and what will be. Live in the now. It’s where you are.