Present

"Live in the present my friend"

The only way to argue this is with counter arguments.

One cannot live in the future, in order to do that one would simply sit and think ahead and never take action, causing a complete loop of the exact same thing.

One cannot live a majority of the time in the future as well, for if this was to happen, then one would be caught up in a systematic and logical order for things.

Life is like Chess, except more complicated. You can plan ahead, and plan ahead, and your opponent will always do something somewhere down the road that you didn't expect.

Unfortunately in life, its horribly impractical to think this way. Its not a game. There aren't any rules. and you have millions and billions of opponents.

It is too much for one person to try to comprehend. Leave the future alone.

As for the past, we have all heard it before; One cannot dwell on the past, and live well in the present.

Why is this though?

The truth again lies in thought power or brain capacity. (For lack of a better term).

If you waste all of it thinking about what happened and not about how to be better because of it, or how to fix it, or how to get over it, then you'll never get anywhere.

and even if you are trying to stay in limbo, thinking about stuff is kinda an oxymoron.

all in all.

you are best off living in the present.

making it up as you go along

just like anything you do, if you try too hard, you'll end up doing less.