“A teacher and his student were standing by the shore. In the distance was a boat. The teacher said to the student ‘forgetting about your mind for the moment, point to the boat’. The student pointed to the boat. The teacher then said ‘forgetting about the boat for the moment, point to your mind’. The student pointed to the boat again”
In dualism, we imagine the mind comes first, occupying an unspecified space, within which the world then appears. But truly, mind and world are the same illumination. But it is not the great illumination.
Dogen said that when we see water, fish see shimmering palaces. Demons see blood. Gods see strings of pearls. But the eyes seeing ‘water’ are without limit, and so the powers of expression of ‘water’ are without limit. This is the great illumination. Likewise, ‘mountains’. Likewise, ‘thinking’.