Since today was the feast of Christ the King in the old calendar, my parish recited the beautiful Act of Dedication of the Human Race to the Sacred Heart today after Mass. Here’s an older version of the prayer.
Most sweet Jesus, Redeemer of the human race, look down upon us humbly prostrate before Thine Altar. We are Thine, and Thine we wish to be; but to be more surely united with Thee, behold, each one of us this day freely dedicates himself to Thy Most Sacred Heart.
Many, indeed, have never known Thee; many, too, despising Thy precepts have rejected Thee. Have mercy on them all, most merciful Jesus, and draw them to Thy Sacred Heart.
Be Thou King, O Lord, not only of the faithful who have never forsaken Thee, but also of the prodigal sons who have abandoned Thee; grant that they may quickly return to their Father’s house, lest they perish of wretchedness and hunger. Be Thou King of those whom heresy holds in error or discord keeps aloof; call them back into the harbor of truth and the unity of faith, so that soon there may be but one fold and one Shepherd.
Be Thou King of all those who even now sit in the shadow of idolatry or Islam, and refuse not Thou to bring them into the light of Thy kingdom. Look, finally, with eyes of pity upon the children of that race, which was for so long a time Thy chosen people; and let Thy Blood, which was once invoked upon them, now descend upon them in a cleansing flood of redemption and eternal life.
Grant, O Lord, to Thy Church assurance of freedom and immunity from harm; unto all nations give an ordered tranquility; bring it to pass that from pole to pole the earth may resound with one cry: Praise to the divine Heart that wrought our salvation; to It be honor and glory for ever and ever. Amen.
The petitions for the salvation of Muslims and Jews which appear above are not in the most recently published version of that prayer (in the 1999 Enchiridion Indulgentiarum).
(Full disclosure: I edited a couple of words in the above text, making it conform more closely to the Latin.)