"Know this" is a decisive sentence, without any exceptions or qualifications. Those who have the misfortune to serve the passions mentioned have no inheritance in the Kingdom of Christ.
They are already excluded from it. Those who merely fall into them, as soon as they fall, are excluded by the very act of falling.
So incompatible is the Kingdom with lusting. The Apostle brings under this sentence only fornication, impurity, and covetousness. He passes over shameful speech, foolish talk, and jesting.
But this does not mean that, according to the Apostle, one may enter the Kingdom with them.
It means that they do not have independent significance for him. They are instrumental actions in relation to those chief passions.
Thus they do not exist when those passions do not exist. Conversely, where those passions are, these also are present. Therefore they will share the same lot with them.
Idle talk and making others laugh appear outwardly not so important. Yet the passion of fornication hides beneath them and sets the tongue in motion.
Judging by this kinship, their importance is very great. A glance also seems insignificant. Yet he who looks at a woman to desire her is condemned as a fornicator.
"Fornicator" and "unclean" are spoken by the Apostle in the same sense as before, fornication and impurity. But the covetous man is characterized by a special and very weighty feature: he is an idolater.
In the Epistle to the Colossians he also calls covetousness idolatry (Col 3:5). And the Lord said that one cannot serve God and mammon (Mt 6:24).
Therefore whoever serves mammon, that is, whoever is enslaved to the passion of acquisitiveness, does not serve God. Mammon has become god for him.
He is devoted to it with all his soul, with all his heart, with all his thought, and with all his strength.
As he ought to have been disposed toward God, so he has disposed himself toward wealth.
Every passion is like this, however. When it overcomes someone, it swallows him whole. For this reason the Apostle also called the belly a god (Phil 3:19).
Yet attachment to wealth has a special feature that places the person possessed by it on one line with idolaters. This is trust in wealth.
One must expect everything from God and rest all one's hopes on Him. But the person possessed by covetousness expects everything from money and wealth.
He rests on them and reposes his hopes in them. Where God ought to stand, mammon stands for him. Thus he is a direct idolater.
"He has no inheritance in the Kingdom of Christ and God." Inheritance, κληρονομια, means what has been appointed to someone as an inheritance.
The unsearchable riches of Christ are all distributed according to the virtues. Each virtue has its own place and its own portion of the riches of Christ.
When the Kingdom of Christ comes, each person will enter where the portion assigned to the virtue in which he especially excelled is found.
All who have labored in the virtues according to faith will be in the Kingdom. For all, abiding there will be ineffably blessed. Yet each will be in his own place and rank.
In the midst of these radiant mansions there is no place for any passion. "Outside are fornicators and idolaters" (Rev 22:15).
This is plainly evident in itself. Yet the Apostle reminds them of it with special force, saying: "Know this." Evidently it was necessary to emphasize this.
Perhaps certain thoughts were circulating that undermined confidence in this truth. Therefore, further on, warning the faithful against crooked interpretations, he writes: