Therefore will I give thanks unto you, O LORD, among the nations, and sing praises unto your name.
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Augustine of Hippo
50. "For this cause will I confess to Thee among the Gentiles, O Lord" (ver. 49). For this cause shall the Gentiles confess to Thee through Me, O Lord. "And I will sing unto Thy Name." And Thou shall be more widely known by My good deeds.
Nations. St. Paul (Romans xv. 9.) adduces this to prove the vocation of the Gentiles. (Calmet)
We cannot doubt but the great things announced in this psalm pertain to Christ. (Berthier)
We see the completion of this prophecy, as there is no Christian nation which does not use the psalms of David to praise God. (Theodoret)
This practice is very common (Pref.; Worthington) in all places where either Jews or Christians are found. ...