The night is far spent, the day is at hand: let us therefore cast off the works of darkness, and let us put on the armor of light.
Read Chapter 13
Ambrosiaster
AD 400
“Night” means the old man, who is renewed through baptism. Paul says that he has passed away like the night and that the day is near, i.e., the sun of righteousness, by whose light the truth appears to us so that we may know what to do. For before we were in the dark, being ignorant of Christ. But when we learned of him the light rose on us and we passed from the false to the true. The “darkness” refers to carnal sins, which are done by worldly enticements…. But to “put on the armor of light” is to do good deeds. Commentary on Paul’s Epistles.
Paul said this, yet look at how many years have passed since then! Yet what he said was not untrue. How much more probable it is that the coming of the Lord is near now, when there has been such an increase of time toward the end! Letter
For the apostle decrees that, "putting off the works of darkness, we should put on the armour of light, walking honestly as in the day, not spending our time in rioting and drunkenness, in chambering and wantonness.".
Non enim "carnis curam gerere ad concupiscent as "didicimus; "honeste autem tanquam in die "Christo, et Dominica lucida vitae institutione, "ambulantes, non in comessationibus et ebrietatibus, non in cubilibus et impudicitiis, non in lit bus et contention bus."
The “day” is the time of this life which remains to us, in which we can do good works. The “night” is the future, in which it will no longer be possible to work. Then we shall lie in the darkness, having lost the chance to do good works. .
The night is passed. That is, the night of sin and infidelity, in which you lived, before you began to serve Christ. (Witham)
St. Paul is here addressing himself to Gentile converts. Before your conversion, you were in the darkness of infidelity: this time is past; now is the day, when the gospel has dissipated the darkness of idolatry, ignorance, and sin. Let us lay aside the works of darkness, by flying from sin, which hates the light, and seeks always to conceal itself; and let us put on the armour of light, the shield of faith, the breast-plate of justice, the helmet of salvation, and the sword of the spirit. (Calmet)
The day is calling us to get ready for the battle. Do not be afraid at the thought of bearing arms. It is a heavy and distasteful duty when we have to bear a visible suit of armor, but in this case it is desirable and worth it. For the arms we are called to bear are those of the light! Homilies on Romans