Nothing matters when you are badly sick. [festivals, food, customs...]
Nothing matters you even when hurt, if you are a realized being.
Nothing matters who is beside you when you experience Oneness. [enemy, friend, animal, ...]
Nothing matters when you know to befriend Death.
Nothing matters when your mind becomes Still.
Nothing matters when you know Who You Are...

Now as I still don't know how to get there, everything matters...
The song that I would love to listen every time is here. Check the link, if interested. :)