Nothing is hidden;
It has always been clear as day.
For divine wisdom: look at the old pine tree;
For eternal truth: listen to the birds sing.
Seeking the mind: there is no place to look;
Can you see the footprints of flying birds?
Above, not a single tile to shelter under;
Below, not a morsel of ground for support.
From the Zenrin, a classic collection of Buddhist wisdom, and quoted in DAVID BRAZIER's The Feeling Buddha.