Sentence:  'Behold', 'dream a dream', 'mingle': these here have something of the plangent tremulousness which comes when Tennyson is writing <WSD>'Parnassian</WSD>' verse. 
Meaning of the word marked with <WSD> tags:  From Gerard Manley Hopkins' writings: describing a style of poetry or language which can only be created by poets, but not in the language of inspiration.