By means of a guardian angel, God is said to introduce images and suggestions leading a person to do what is right. Honorius of Autun (12th Century) said that every soul was assigned a guardian angel the moment it was put into a body. Thomas Aquinas (13th Century) agreed with Honorius and once said, "On this road man is threatened by many dangers both from within and without, and therefore as guardians are appointed for men who have to pass by an unsafe road, so an angel is assigned to each man as long as he is a wayfarer." In the 15th century, the Feast of the Guardian Angels was added to the official calendar of Catholic holidays.
Guardian Angel (18th Century) by Unknown - Public Domain Catholic Painting
A free downloadable public domain Catholic painting.