If you want to be free,
Get to know your real self.
It has no form, no appearance,
No root, no basis, no abode,
But is lively and buoyant.
It responds with versatile facility,
But its function cannot be located.
Therefore when you look for it,
You become further from it;
When you seek it
You turn away from it all the more.

- Linji (d. 867)

Then how does one "get to know it" if you cannot "look for it"? This Zen stuff is hard. ;~)