The Catholic Church also teaches that there is no new public
revelation possible after the death of the Evangelist John. Any
thing else approximating new messages would be private
The Catholic Church applies the teaching of the Bible to her
judgment of such private devotions.
1 John 4:1
Beloved, do not trust every spirit but test the spirits to
see whether they belong to God, because many false
prophets have gone out into the world.
Matthew 7:17-18, 20
Every good tree bears good fruit, and a rotten tree
bears bad fruit. A good tree cannot bear bad fruit, nor
can a rotten tree bear good fruit. ... So by their fruits
you will know them.