Before I had studied Zen for thirty years,
I saw mountains as mountains,
and waters as waters.
When I arrived at a more intimate knowledge, I came to the point where I saw that mountains are not mountains,
and waters are not waters.
But now that I have got its very substance
I am at rest.
For it's just that 
I see mountains once again as mountains,
and waters once again as waters.

Li Ching-Yuen (?-1933 CE), Li Ching-Yuen was a Chinese herbalist, martial artist and tactical advisor, known for his supposed extreme longevity.