The Engagement Vindicated; From all the Objections, Cavils, Scruples, that wilfull Opposers, or doubtfull, unresolved Iudge- ments may cast upon it. Wherein, All such Objections are answered; The Government proved; The Engagement it self both lawful, and necessary, from clearest Principles of Conscience and Reason. To the satisfaction of all such as are doubting