In zazen, our normal strategies of repression and distraction don’t work. We have no choice: everything that arises expresses itself. It isn’t me expressing mySelf, and so, it is full expression. Likewise, although the activity of zazen is full and complete activity, it is not the activity of the self.
If we can understand zazen as activity and expression, then we can understand the world similarly
In this sense, zazen is the full expression of Buddhist activity