Hi, Anthony —

They stem from a private revelation, and private revelations are not binding on the public, so we need not value them at all, but they do seem to be consonant with the faith and it would not be wrong to place value on them but we have to avoid superstition.

The prayers are not magic and must be done in faith in Christ, and we have to live Christian lives. 

I am not very familiar with this devotion, so I'm sorry if you were looking for deeper detail.

Hope this helps,

Eric