Ps 149:6

“But the saints who "exult in glory," no need is there for us to say how they exult: just hear the verse of the Psalm which follows: "The saints shall exult in glory, they shall rejoice in their beds:" not in theatres, or amphitheatres, or circuses, or follies, or market places, but "in their chambers." What is, "in their chambers"? In their hearts. Hear the Apostle Paul exulting in his closet: "For this is our glory, the testimony of our conscience." [2 Corinthians 1:12] On the other hand, there is reason to fear lest any be pleasing to himself, and so seem to be proud, and boast of his conscience. For every one ought to exult with fear, for that wherein he exults is God's gift, not his own desert. For there be many that please themselves, and think themselves righteous; and there is another passage which goes against them, which says, "Who shall boast that he has a clean heart, and that he is pure from sin?" [Proverbs 20:9] There is then, so to speak, a limit to glorying in our conscience, namely, to know that your faith is sincere, your hope sure, your love without dissimulation. "The exultations of God are in their mouths" [Psalm 149:6]. In such wise shall they "rejoice in their closets," as not to attribute to themselves that they are good, but praise Him from whom they have what they are, by whom they are called to attain to what they are not, and from whom they hope for perfection, to whom they give thanks, because He has begun.”

“Hands. He seems to allude to the regulation of Nehemias, (2 Esdras iv. 17.; Haydock) or to the Machabees, who were priests and soldiers. They shall proclaim God’s praises, and defend the nation. In the spiritual sense, Catholics employ the two-edged sword of the Old and New Testament against heretics, and exercise the power of Christ in excommunicating the wicked. (St. Jerome) — Our Saviour enables the saints to judge at the last day, Matthew xix. 28. (Calmet) — This chiefly regards such as have left all things, like the apostles, and those who embrace a monastic life, Matthew iv. 20., and xix. 27., Acts iv. 34., and 1 Corinthians vi. 3. — They shall judge whether people have made good or bad use of their possessions. (St. Augustine) (Ven. Bede) — All the blessed will approve of God’s sentence; and their example in overcoming difficulties, will evince the baseness of the wicked, who have yielded to less temptations. (Worthington)”