Sentence:  A thousand times he was like to have denyed all, but durst not defame the most sacred Idol of his Soul: Sometimes he thought his Uncle would be generous, and think it fit to give him Silvia; but that Thought was too <WSD>Seraphick</WSD> to remain a Moment in his Heart. 
Meaning of the word marked with <WSD> tags:  Pure and sublime; angelic.