There are many great Bible verses on this but one that sticks out to me is:
“And whenever the unclean spirits saw him, they fell down before him and cried out, “You are the Son of God.”” - Mark 3:11
The evil spirits know the name of Jesus. While we can’t perform an exorcism like I mentioned in my above post, we can call upon the name of Jesus.
Think about in confession, you can call upon the name of Jesus like so: “Father, I have committed the sins of pornography and masturbation and I call upon the name of Jesus to help me to fight lust.”
It’s this great power that the name of Jesus has. I love the St. Michael prayer, I say it sometimes 5-10 times a day (I get paranoid/scared at night by noises and I’m 20YO lol)
There is absolutely nothing wrong with wearing the medals, he is a St. for a reason and a good one! While you shouldn’t be using the medal and throwing holy water at people to exorcise them, just wearing the medal has great protective powers. It’s like wearing a Miraculous Medal, just wearing it has some powers that come with it.
But no, you don’t speak to demons that would be bad and a trick of the devil. If you feel you are tempted say in your mind or out loud “Jesus expel this temptation and any evil that is trying to attack me.” And then say the St. Michael prayer!