“And fall short of the glory of God.” The expression translated “fall short,” ὑστεροῦνται, means that they do not have the glory of God. The glory of God is not in them.
This may also have the following meaning: there is no glory to God among them or from them.
They have sinned, and there is no glory to God from them. God is not glorified among them or by them. On the contrary, the name of God is blasphemed by them.
Thus Oecumenius says: “They have fallen away from glorifying God. All have fallen away from rendering God the honor due to Him.
The Jews did so as transgressors of the commandments of the law. The Gentiles did so as worshippers of idols.”
But the more direct thought here is that because of their sins they are deprived of the glory with which they would have been clothed by God.
This would have been theirs if they had not sinned, but had walked in His will and fulfilled His commandments.
Those who cleave to God and remain faithful to Him bear upon themselves the radiance of God’s glory.
God clothes them with this glory because of the Godlikeness present in them. So it was predestined in the beginning, and so it was in the first-created.
After the transgression of the commandment, this glory was darkened and remains darkened. Man does not restore it. Rather, he darkens it more and more.
They did not duly honor God by faithfulness to His commandments, and God stripped them of the glory predestined for them.
St. Chrysostom says: “Lest the Jews say, ‘Although we sin, we do not sin like the Gentiles,’ the Apostle added, ‘and fall short of the glory of God.’
Although your sins are not the same as the sins of others, you are nevertheless equally deprived of glory. For you too have offended God.
The offender belongs not to those who are glorified, but to those who are put to shame.”
Theophylact writes: “Even if he, the Jew, did not sin as the Gentile did, he is equally deprived of glory, because he offended God.
Such an offender reaps not the fruit of glory, but of dishonor.”
This applies not only to the Jews, however, but to all who have sinned in general.
By mentioning this glory, the Apostle wishes to stir their zeal to take measures for its restoration.
For what could be more worthy of our striving than to be clothed with the glory of God?
But this stirring of zeal could have turned into despair because of the universal sinfulness which the Apostle had previously described. There is no strength to escape it, and therefore no strength to be counted worthy of glory.
To prevent this, the Apostle hastens to indicate the God-established path to righteousness offered by the Gospel: “being justified freely,” and what follows.
It is as though he were saying: “Do not be afraid. I did not say this to cast you into despair, but to show the love for mankind of the Master,” as St. Chrysostom says.