This verse is part of a larger section of Paul's letter to the Romans, in which he is discussing the Christian's relationship to the governing authorities and to the world around them. In this verse, Paul is urging the us to live in such a way that they are ready for the coming of the day of the Lord, when Jesus will return in glory.
Paul is encouraging us to put aside the deeds of darkness, which would include sinful or ungodly behaviors, and instead put on the armor of light, which would include living a righteous and holy life. By doing this, we can demonstrate their love for God and their commitment to following Him.
In this context, "deeds of darkness" refers to actions or behaviors that are contrary to God's ways and that bring shame or guilt. These could include sinful acts, ungodly attitudes, or any other behavior that is not in line with God's will. By putting aside these "deeds of darkness," we are able to live in a way that honors God and demonstrates their love for Him.
On the other hand, "the armor of light" refers to the protective armor that Christians are called to put on in order to live a life that is pleasing to God. This armor is not a physical armor but a spiritual one, made up of the qualities and attitudes that are in line with God's will. By putting on this armor, we are demonstrating their commitment to living a life that is pleasing to God and that honors Him.
Putting aside the "deeds of darkness" and putting on the "armor of light" is a call to live a life that is pleasing to God and that honors Him. This requires a conscious effort to live in accordance with God's will, demonstrating love and commitment to Him in all areas of life.
See also: vs 13-14
Romans 13:12. The night is far gone, and the day is near. Let’s therefore throw off the deeds of darkness, and let’s put on the armor of light.