Deepak Chopra:
Right, and when I speak of passion in love,
I also mean passion in life.
When you lose passion in love,
then you lose passion for everything else,
because life is an expression of that passion that you have in love.

One of my favorite poets has been Rumi,
whom I quote very frequently.
He said,

the most important thing you can do in your life
is to become a passionate lover,
and if you are a passionate lover,
then you'll be a lover in life,
you'll be a lover in death,
you'll be a lover in the tomb,
you'll be a lover on the day of Resurrection,
you'll be a lover in Paradise,
and you'll be a lover forever.

And if you've not been a passionate lover,

then don't count your life as having been lived.