The Human Route

The Human Route, by Zen Master Seung Sahn, on a card from the people at DharmaCrafts.com:

Coming empty-handed, going empty-handed — that is human.
When you are born, where do you come from?
When you die, where do you go?
Life is like a floating cloud which appears.
Death is like a floating cloud which disappears.
The floating cloud itself originally does not exist.
Life and death, coming and going, are also like this.
But there is one thing which always remains clear.
It is pure and clear, not depending on life and death.
What is that one pure and clear thing?