Dream as if you'll live forever. Live as if you'll die today.

Work as though you would live forever, and live as though you would die today. Go another mile!

Do for this life as if you live forever, do for the afterlife as if you die tomorrow.

Live as if you were to die tomorrow. Learn as if you were to live forever.

I intend to live forever, or die trying.

Plan for this world as if you expect to live forever; but plan for the hereafter as if you expect to die tomorrow.