The short prayer of protection, said after Mass for most of the last century.
A brief prayer asking the archangel Michael for defense in spiritual battle.
When: After Mass, at night, or the instant something turns dark.
Why: The Church has never pretended the fight is only internal. This prayer names the enemy plainly and asks for help, in about fifteen seconds.
Saint Michael the Archangel, defend us in battle. Be our protection against the wickedness and snares of the devil. May God rebuke him, we humbly pray, and do thou, O Prince of the heavenly host, by the power of God, cast into hell Satan and all the evil spirits who prowl about the world seeking the ruin of souls. Amen.