"Time is free...

...but it's priceless. You can't own it, but you can use it. You can't keep it, but you can spend it...

Think of a super power. Any kind. Which one would you have?
Well, just in case you want to know (and even if you don't really care), I would want the power to travel through space and time.
Let's look at our other options for a super cool super power. What if you could pull an Edward and read minds.
Cool.
Except what's that going to do except break your heart and make you lose faith in humanity (people have mean thoughts)? While taking a test you could peer into the mind of the genius sitting in the second row from the front to find the answers.
BUT, if you had the power to time travel, you could just travel to the past, look up the answers while you've got 'em, and then travel back to the time of your test.

Okay, so you wanna fly. Wellll, why exactly do you want to fly? 'Cause it'd be awesome? Believe me, it's probably not. It's cold up there and it's pee-your-pants scary being so high. Plus, I'm sure it would take a lot of effort. Although, if you had the power to space, you could just time travel right to the place you'd want to go.
You know when your alarm goes off at six in the morning, and you're literally dragging yourself out of bed? Welllll, the power to travel through time means that you could also pause it. Pause it for an hour or two to catch up on sleep.
Have you ever really wanted to tell somebody off, but have been too scared to actually do it? Well if it does turn out as badly as you think. Zip! Just think yourself back to the past, and problem's solved.
Have you ever heard a really good song or idea or invention and just wished that you could come up with something like that? Wellllllll, you could if you had this time traveling power we're talking about.

I could time travel back to the sixties and get my favorite foursome to sign their White Album.

Think about it, every mistake you've ever made, you could unmake, while still learning from that mistake. Every glass of milk you've ever spilt, you could unspill. Every feeling you've unintentionally hurt, you could heal. Every secret you've mistakenly told you could take back. If life came with a rewind button I think we'd all be so much happier.

But it doesn't, and that's what makes life life. That's what makes us wise. The times when we've been hurt, the people who we've hurt. If you knew, while making a choice, that you'd have the power to undo it, would that choice you'd have to make still be as crucial?

It's weird, I know, but I've thought about this a lot. I've thought about all the flaws to this plan, and why it's impossible. Let's say you went back in time to your tenth birthday, would it still be you? Would your mind travel or would your whole body go? Well, how could there be two of you? When you stop time, would your heart still be beating? If it is, that must mean you'd be aging. So every time you'd stop time, you wouldn't really. You'd just stop the world. You'd stop movement, you'd stop gravity and thought.
Earlier I said you could catch up on a couple hours of sleep if you stopped time. Isn't two hours an amount of time, though? Doesn't that mean time would still ticking. It's hard to wrap your mind around.

I play with the idea over and over and over again. So many things, if I could, I'd take back. So many stupid things I've said and done. So many regrets, mistakes, and tears that I could fix.

But I can't, and it's stupid that I've just wasted all this time talking about the impossible. Comparing the preferred impossibility to all those other lame possibilities.

...Once you've lost it, you can never get it back."