In today’s First Reading, amidst the calamities and evils narrated in the book of Revelation, John has a consoling vision of the righteous surrounding Our Lord (the Lamb). Mount Zion refers to Jerusalem, the traditional place where the faithful remnant will gather under the Messiah’s reign. The righteous bear the name of the Father and the Lamb on their foreheads, in contrast with the pagans who bear the name or number of the Beast.
They follow the Lamb wherever he goes, which means they followed him all the way to Heaven, but by way of Calvary. They’re faithful disciples who have no deceit on their lips because they didn’t deny Christ or do homage to the Beast. Lying is characteristic of the opponents of Christ. They’re unblemished because they have made a perfect untainted sacrifice of themselves to God, singing a song of praise unique to them because it comes from a heart that loves Our Lord completely.
Any one of us could form part of this group, because everyone is called to holiness. All we have to do is offer Our Lord everything we have and are, fulfilling the duties of our state of life (married, consecrated, ordained, etc.) with love for him and for souls. It’s never too late on this earth to start.