"Thou shalt remove thy limbs, for they shall go to the immobile.
Thou shall not bear children, for they shall go to the best pairs.
Thou shall retain thy bosom, for it is the seat of thine heart, the stabilizer of thine body.
Thou shall retain thy heart and mind, for they are needed to worship, love and pray."

They pledged their vows to God, and are now dedicating their life to prayers. They shall be helped by other sisters who haven't made their oath yet.

They're part of an obscure religious order of enclosed nuns, who dedicate their life to prayers only. They are quite extreme in their oath, leading them to lose most of their bodies when they enter the order. For ages it was famous for welcoming unwanted women from noble families, to impede a division of the house lands.