Sentence:  ... Reaſon and Reflection, which by repreſenting perpetually to the mind of Man the meanneſs of all ſenſual Gratifications, do, in great meaſure, blunt the edge of his keeneſt Deſires, and <WSD>pall</WSD> all his Enjoyments. 
Meaning of the word marked with <WSD> tags:  To make vapid or insipid; to make lifeless or spiritless; to dull, to weaken.