The Decalogue laid down as rules for conduct: 'Thou shalt not steal;' 'Thou shalt not kill;' 'Thou shalt not commit adultery.' Christ spiritualized these rules into their essence: 'Thou shalt love thy neighbor as thyself;' 'Whosoever looketh on a woman to lust after her, hath committed adultery already with her in his heart.' It is manifest that both the old and the new covenant upon which modern Christianity is supposed to rest, suffered no transactions in matters so clear to the human conscience.

Jesus himself refined upon the legality of the Mosaic code by defining sin as egotism or concupiscence.
But the Company of Jesus took pains in their casuistry to provide attenuating circumstances for every sin in detail.

By their doctrines of the invincible erroneous conscience, of occult compensation, of equivocation, of mental reservation, of probabilism, and of philosophical sin, they afforded loopholes for the gratification of every passion, and for the commission of every crime.

Instead of maintaining that any injury done to a neighbor is wrong, they multiplied instances in which a neighbor may be injured.

Instead of holding firm to Christ's verdict that sexual vice is implicit in licentious desire, they analyzed the sensual modes of crude voluptuousness, taxed each in turn at arbitrary values, and provided plausible excuses for indulgence.
Instead of laying it down as a broad principle that men must keep their word, they taught them how to lie with spiritual impunity and with credit to their reputation as sons of the Church.