The oath of the Jesuits to serve the Pope according to his pleasure, along with Loyola’s vitriolic hatred of the doctrines of Grace, inevitably would lead to the Jesuit mission to effect a "counter-reformation" by declaring war on the true Christian faith. This mission is reflected in this excerpt of the Jesuit oath:

"I furthermore promise and declare that I will, when opportunity present, make and wage relentless war, secretly or openly, against all heretics, Protestants and Liberals, as I am directed to do, to extirpate and exterminate them from the face of the whole earth; and that I will spare neither age, sex or condition; and that I will hang, waste, boil, flay, strangle and bury alive these infamous heretics, rip up the stomachs and wombs of their women and crush their infants' heads against the walls, in order to annihilate forever their execrable race. That when the same cannot be done openly, I will secretly use the poisoned cup, the strangulating cord, the steel of the poniard or the leaden bullet, regardless of the honor, rank, dignity, or authority of the person or persons, whatever may be their condition in life, either public or private, as I at any time may be directed so to do by any agent of the Pope or Superior of the Brotherhood of the Holy Faith, of the Society of Jesus".