Sentence:  it is not easie we should so often settle our minds in so regular, so reformed, and so devout a seat, where indeed it ought to be, to pray <WSD>aright</WSD> and effectually: otherwise our praiers are not only vaine and unprofitable, but vicious. 
Meaning of the word marked with <WSD> tags:  Rightly, correctly; in the right way or form.