An exercitation concerning vsurped powers : wherein the difference betwixt civill authority and vsurpation is stated : that the obedience due to lawfull magistrates, is not owing, or payable, to usurped powers, is maintained : the obligation of oaths, and other sanctions to the former, notwithstanding the antipolitie of the latter is asserted : and the arguments urged on the contrary part in divers late printed discourses are answered : being modestly, and inoffensively managed /