How to do the Koan study? I want to work on the Koan,'What was your original face before you were born' and 'Who am I',How do I go about it.

Should I constantly ask myself this question? Should I write it down?

How is the Koan practise done?
Koans break the intellectual mind and require deeper investment.


  SN41.6:1.4: “Householder, there are three processes. Physical, verbal, and mental processes.”


Practice a koan physically, verbally and mentally. For example, walk with it, speak it and feel it.

This sounds mysterious, but is actually practical. To walk with a koan, one might attend to "left foot original face", followed by "right foot original face". When meditating, one could silently speak the koan. To feel it one could look at anything that appears as "this tree original original face feels tall", "this car original face feels fast". And so forth. In other words, tie the koan into everything seamlessly. 

In this way one discovers "original face" and can answer the Roshi by presenting the original face. It takes much practice because most of us are distracted by other stuff day-to-day and moment-by-moment.

My koan was Joshu's Mu. Everything was Mu. Same practice, however.