In my zeal, I missed the cite. Sorry.
Also, I cannot answer your question nor can I interpret the meaning of the quotation you provided.
My source for the Virgin's messages is "MEDJUGORJE the Message" by Wayne Weible, a Protestant journalist who investigated the Medjugorje event. This book was given to me by a very devout Catholic who went on a Pilgrimage to Medjugorje. The Virgin Mary's last message was the only message I read and it caused me to weep. The message was on the last page of the book. I was so over-taken by the message, and my spontaneous response to it, I never read the book. (I have a habit of looking at the last page of a book before I read it.)
I am essentially an agnostic, in the sense of not being attached to any church nor to orthodoxy. But, I believe in and attempt to fully practice Christian humanism. And, it ain't easy to do so at times.
Is an agnostic just not belonging to a church? I always wondered what that meant. lol So what is a gnostic? Sorry for sounding so ignorant, but I am ignorant to what these words mean. :o)
I originally and purposely responded to your post for good reason:
"Whether it's the GOOD message or the serious prophecy - don't discredit the messenger."
As an agnostic, you may or may not believe in the metaphysical spiritual world.
IF you do, there are the entities of God (and His Angels), and Satan (and His Angels [Demons]).
There is a spiritual war waged at this very moment. At stake is the eternal human soul. Job #1 of Satan is to "deceive the elect" on earth as prophesied in the Bible and create a chasm of doubt between the deity of Jesus Christ, the Savior and man.
With respect to your post, when part or any of such message from "Our Lady" is a lie, then ALL of it is a lie. And that's what makes it necessary to "discredit" it.
I admire you hunger for spiritual guidance, and pray that God gives you wisdom and strength to prevail in His truth.