528. To this I will add the following. It is said in the church that no one can fulfill the law, and the less so since anyone who sins against one commandment of the Decalogue sins against them all. But this conventional maxim is not as it sounds; for it is to be understood in this way, that anyone who purposefully or deliberately acts against one commandment acts against the rest, since to act purposefully or deliberately is to deny altogether that the action is a sin, and anyone who denies the existence of sin regards it as nothing if he acts against the rest of the commandments. Who does not know that one who is an adulterer is not on that account a murderer, thief, and false witness, nor wills to be? But one who is a purposeful and deliberate adulterer - such a one regards everything having to do with religion as nothing, including therefore murder, theft, and false witness; and if he refrains from them, he does not do so because they are sins, but because he fears the law and damage to his reputation. It may be see above, nos. 490-493, and in two narrative accounts, nos. 500 and 521, 522, that purposeful and deliberate adulterers account the sacred tenets of the church and religion as nothing. The case is the same if anyone acts purposefully or deliberately against any other commandment of the Decalogue, namely, that he acts also against the rest, because he does not regard anything as a sin.