saint that appeared to her fellow religious sister after she had died and said that she would return to earth and suffer a life of pain until the end of time if she could receive the glory that God gave in reward for a single Hail Mary in exchange.
I just Googled this and found Of all the prayers of the Rosary, I personally beli
eve the Hail Mary is the most
powerful. Tradition has proved this belief. When
St. Teresa of Avila died, about week
later she appeared to the nuns in her convent respl
endent in glory. She then proceeded
to the nuns that if she could come back to earth, w
hich she added she could not, but if
she could she would gladly endure of all the pains
of the world till the end of the world,
just to merit the additional degree of glory for sa
ying one devout Hail Mary.
It was in a PDF file by a Catherine Moran, Ph.D, titled "Praying the Rosary with the Saints.’