There's nothing last forever on this earth. And as you said that you can live twice, I got your point, and that is true, that we can live physically here on earth and after death, we live spiritually on heaven.
There's a lots of thing that can be done on "dash" between life and death. We only live once physically, so as long as we live here on earth we should do the things at our best and bring life to the fullest. Do not waste even a single moment of your life to unlawful things, or you will end up to full of regrets. Used your life too as what is God has planned for you so that when you end to death MISSION ACCOMPLISHED!!!!Then another journey of life begins with Him
I look so forward to the next life