I had studied the Dharma for thirty years, I saw mountains as mountains, and
rivers as rivers. When I arrived at a more intimate knowledge, I came to
the point where I saw that mountains are not mountains, and rivers are
not rivers. 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 rivers once
again as rivers."
― Qingyuan Weixin, 9th Century