"the understanding of human weakness. . . . never means compromising and falsifying the standard of good and evil in order to adapt it to particular circumstances."

"'. . . God's command is of course proportioned to man's capabilities; but to the capabilities of the man to whom the Holy Spirit has been given; of the man who, though he has fallen into sin, can always obtain pardon and enjoy the presence of the Holy Spirit.'
     "In this context, appropriate allowance is made both for God's mercy towards the sinner who converts and for the understanding of human weakness. Such understanding never means compromising and falsifying the standard of good and evil in order to adapt it to particular circumstances. It is quite human for the sinner to acknowledge his weakness and to ask mercy for his failings; what is unacceptable is the attitude of one who makes his own weakness the criterion of the truth about the good, so that he can feel self-justified, without even the need to have recourse to God and his mercy. An attitude of this sort corrupts the morality of society as a whole, since it encourages doubt about the objectivity of the moral law in general and a rejection of the absoluteness of moral prohibitions regarding specific human acts, and it ends up by confusing all judgments about values."

     St. John Paul II, Veritatis splendor 103-104, underscoring mine.