Sentence:  But I hope this new Messenger from Heauen doth bring happie tidings of some munificent and liberall Patron to these rauishing (but impouerishing) studies, by whose gracious bountie the most <WSD>recondite</WSD> mysteries of this abstruse and diuine science [astronomy] shall at length be manifested. 
Meaning of the word marked with <WSD> tags:  Difficult to grasp or understand; abstruse, profound.