Describe symbolism in Merlin Enthralled by Richard Wilbur

In Lines 25-28, the stanza joins together Merlin's thoughts with the thoughts Niniane wants him to think, and it also introduces the symbolism of water. Line twenty-five uses "mountain water" to express how clear his thoughts are when he gives in to the sorceress's spell. In Line 26, the dream is described "deep" and "transparent", drawing a relationship between dreaming and water.