Over the next week or two – whatever your degree of vocal prowess or religious belief – you are likely to join in some form of communal singing.

Whether it’s ‘O Come, All Ye Faithful’, ‘All I Want For Christmas Is You’ or ‘Feliz Navidad’, you will be obeying the exhortation of Psalm 100: “Make a joyful noise to the Lord, all the earth. Serve the Lord with gladness; come into His presence with singing.”

Carols and seasonal songs are so integral to this time of year that we don’t probe the reason for their presence in churches, homes and so many other shared spaces. St Augustine of Hippo, born in the fourth century, can enlighten us. He said: “Cantare amantis est.” In other words, “To sing is the act of a lover,” or, as the Pope put it at the Jubilee of Choirs in Rome last month, “Singing belongs to those who love.” When we love deeply, silence is not enough. Love, with all the trust and joy it engenders, seeks expression, and it finds expression through song.

Christmas is the feast of God’s love made flesh. Our carols are songs of love to the God who comes among us. As Pope Leo reminded the singers assembled in St Peter’s Square, song can be a way of praying, lifting the soul towards the mystery we celebrate. When we sing, we join the angels who announced “Glory to the newborn king”.

Of course, the spiritual power of song is not restricted to Christmas and the people who celebrate it. It was in Judaism that the Psalms first became shared prayers, and at Hanukkah – the festival of light that so often coincides with Advent or Christmas – families and congregations sing to glorify God as candles glow.

In the Qawwali music of Sufi Islam, voices weave together in devotion. In Hinduism there are bhajans, in Buddhism chants, all expressing the universal impulse to give voice to love and reverence. To return to Psalm 100, our songs will ring out as we enter God’s gates with thanksgiving, and His courts with praise.

In a world that is so often fractured, communal singing produces both musical and spiritual harmony. So let us sing – not because custom demands it, but because love compels it. Through the simple and affirmative act of raising our voices together in this season of joy, and as members of the human race, we both convey and embody a crucial message: that what unites us is far greater than what divides us.