453. (viii) The lust for fornicating is serious, so far as it has adultery in view.
All who lust for fornication have adultery in view, if they do not believe adultery to be a sin and take the same view of marriage as of adultery, with the sole difference that one is lawful and the other unlawful. These people also make one evil out of them all, mixing them together, like dirt with palatable food on one plate or like rubbish mixed with wine in one cup, and so eat and drink. They behave in the same fashion with sexual love, fornication, having a mistress, the milder, serious and very serious kinds of adultery, even with debauchery and deflowering. In addition, they not only mix all these sins together, but they confuse them with marriage, desecrating this with similar ideas. But those who do not distinguish even marriage from those sins are, after roving contacts with the other sex, the prey of coldness, dislike and nausea, at first felt for the wife, then for their other women and finally for the whole female sex. It is self-evident that in their case there is no plan, intention or aim at good or chaste behaviour to excuse them; nor is there any separation of evil from good, or unchastity from chastity, to make them pure, as in the case of those who from their fornication look towards conjugial love, preferring this (as described in the previous section, 452).
I can report a new fact from heaven as a confirmation of this. I have met many people who lived in the world outwardly like others, wearing fine clothes, dining sumptuously, making profits from business like others, going to the theatre, making rather indecent jokes about sex, and much else of the same sort; yet the angels blamed some of them for sinning and others they did not, calling one group innocent, the other guilty. When they were asked why this was when both groups had behaved alike, they answered that they view everyone from the point of view of their plan, intention and aim, making this the means of discriminating. So they excused or condemned those whom their aim excused or condemned, since all in heaven have good as their aim, and all in hell have evil as theirs. It is precisely this which is meant by the Lord's words:
Do not judge so as not to be condemned. Matt. 7:1.