Sentence:  And why should God enter covenant with a people to be holy, as "the Command is holy, and just, and good, Rom." 7.12 and yet suffer an impure and treacherous dispence to mislead and betray them under the <WSD>vizard</WSD> of Law to a legitimate practise of uncleanness. 
Meaning of the word marked with <WSD> tags:  Outward appearance; pretense.