And do not swear by your head, for you cannot make one hair white or black. Let what you say be simply Yes' or `No'; anything more than this comes from evil.

Matthew 5:36-37

"The devil is afraid of us when we pray and make sacrifices. He is also afraid when we are humble and good. He is especially afraid when we love Jesus very much. He runs away when we make the Sign of the Cross."

- St. Anthony of Padua