"Holy water is kept in the font, the church furnishing used for baptisms, which is typically located at the entrance to the church (or sometimes in a separate room or building called a baptistery); its location at the entrance serves as a reminder of the centrality of baptism as the primary rite of initiation into the Christian faith."
"Smaller vessels, called stoups, are usually placed at the entrances of the church."
"This use of holy water and making a sign of the cross when entering a church reflects a renewal of baptism, a cleansing of venial sin, as well as providing protection against evil."
"It is sometimes accompanied by the following prayer:
'By this Holy water and by your Precious Blood, wash away all my sins O Lord."
"In the Middle Ages the power of holy water was considered so great fonts had locked covers to prevent the theft of holy water for unauthorized magic practices: the Constitutions of Archbishop Edmund Rich (1236) prescribe that "Fonts are to be kept under lock and key, because of witchcraft (sortilegia).