Sentence:  Forget the Boys, forget your loyalties to your Dead, first of all to Rebekah, for she, they, are but distractions, temporal, flesh, ever attempting to drag the Uranian Devotee back down out of his realm of pure <WSD>Mathesis</WSD>, of that which abides. 
Meaning of the word marked with <WSD> tags:  Mental calculation or discipline; science, especially mathematical learning. (from 15th c.)