Thirty years ago, before I began the study of Zen, I said, ‘Mountains are mountains, waters are waters.’ After I got insight into the truth of Zen through the instructions of a good master, I said, ‘Mountains are not mountains, waters are not waters.’ But now, having attained the abode of final rest, (that is, Enlightenment) I say, ‘Mountains are really mountains, waters are really waters.’

Are the three understandings the same or different?

Ch’ing yuan Wei-hsin of the T’ang Dynasty

(Source: sped2work.tripod.com)