“参禅之初，看山是山，看水是水；禅有悟时，看山不是山，看水不是水；禅中彻悟，看山仍然山，看水仍然是水。”

These are all from the Zen philosphy, it says:

When getting start with Zen, I see hill as hill, water as water When get experienced with Zen, I see hill as more than hill, water as more than water. When finally got mature with Zen, I once again see hill as hill, and water as water.