Sentence:  ... If this law / Of nature be corrupted through affection, / And that great minds, of partial indulgence / To their <WSD>benumbed</WSD> wills, resist the same, / There is a law in each well-order'd nation / To curb those raging appetites that are / Most disobedient and refractory. 
Meaning of the word marked with <WSD> tags:  To deaden, dull (the mind, faculties, etc.).