Sentence:  Sing Heav'nly Muſe, that on the <WSD>secret</WSD> top / Of "Oreb", or of "Sinai", didſt inſpire / That Shepherd, who firſt taught the choſen Seed, / In the Beginning how the Heav'ns and Earth / Roſe out of "Chaos": [...] 
Meaning of the word marked with <WSD> tags:  Withdrawn from general intercourse or notice; in retirement or secrecy; secluded.