Do you have a scripture reference for this, or is this oral tradition?
Becky
It all follows logically from the concept of grace and what being "full of grace" means. This, of course, hinges on the Greek meaning of "kerichrom" of "kodachrome" or whatever word that is.
And here's a surprise, Protestants translate it differently than Catholics do! :-)
In short, if I am "full of grace" I can not have any sin within me. Not an iota, not a microgram. Being full of grace means that my soul is spotless, it is ready for immediate entrance into Heaven. The use of the term to refer to Mary by the Angel at the Annunciation is the Scriptural basis.
SD