Ps 125:2

“"Then was our mouth filled with joy, and our tongue with exultation" (ver. 2). That mouth, brethren, which we have in our body, how is it "filled with joy"? It useth not to be "filled," save with meat, or drink, or some such thing put into the mouth. Sometimes our mouth is filled; and it is more that we say to your holiness, when we have our mouth full, we cannot speak. But we have a mouth within, that is, in the heart, whence whatsoever proceedeth, if it is evil, defileth us, if it is good, cleanseth us. For concerning this very mouth ye heard when the Gospel was read. For the Jews reproached the Lord, because His disciples ate with unwashen hands. They reproached who had cleanness without; and within were full of stains. They reproached, whose righteousness was only in the eyes of men. But the Lord sought our inward cleanness, which if we have, the outside must needs be clean also. "Cleanse," He saith, "the inside," and "the outside shall be clean also." ...Guard the mouth of thy heart from evil, and thou wilt be innocent: the tongue of thy body will be innocent, thy hands will be innocent; even thy feet will be innocent, thy eyes, thy ears, will be innocent; all thy members will serve under righteousness, because a righteous commander hath thy heart.”

“The Lord our God has granted, to whom we give thanks together, that we might see you and be seen by you. And if this is why our mouth is filled with joy and our tongue with exultation because we have seen each other in mortal flesh, what will our joy be like when we see each other where we fear nothing of each other? The Apostle says: Rejoicing in hope. Therefore, our joy, which is now in hope, is not yet in reality. But hope that is seen is not hope, he says: for what a man sees, why does he hope? But if we hope for what we do not see, we wait for it with patience. If, however, companions rejoicing together while journeying, what joy will they have in the homeland?”

“Shall. Or “did;” (Calmet) though the future is here well employed. (Berthier) — The prophet uses both tenses, shewing the certainty of the event. (Worthington) — It would require some time before the Gentiles would become sufficiently acquainted with the concerns of the Jews. (Berthier) — As soon as they did, they expressed their admiration, while the former were careful not to imitate the conduct of those who murmured at leaving Egypt. (St. Chrysostom)”