Catholics and some other Christian churches are celebrating the feast of St Michael and All Angels today. The tradition has it that Archangel Michael is the chief of all Archangels who has defeated Satan during the war in Heaven. Celebrated after autumnal equinox, when the nights get longer and the proper autumn begins, it invokes angelic protection against the forces of darkness.
This site describes UK traditions in celebrating Michaelmas (you can also read about it on Wikipedia). Of course, according to the old Celtic calendar, the equinox marks mid-autumn and not it's beginning. While I'm not a Catholic myself, I think there is no harm in remembering an old European traditional feast. I found some inspirational sayings online.
Here is one of them:
We are lucky to be surrounded with angels sent by God who are always
there to keep us safe and happy….. Sending my best wishes on
Do you celebrate Michaelmas?