It's shocking how that we're all the time thinking either about the past or about the future, very rarely we focus on the moment and live it.
While planning, thinking, visualizing, worrying, wondering about the future we forget to live the moment and enjoy it.
While in the present very simple things can make our days, spending quality time with our family, or doing something we genuinely enjoy.
It sounds like a phrase straight out from a motivational speech but, seize the moment, there's not a single moment that will be identical to this one, it might be a bit similar, but never identical.
Stop worrying, and start living.