Haha, now you're putting me on the spot ;)
In short, I think it means that private revelation is always at the service of the public relevation of Christ (that is the deposit of the faith, delivered once for all through HIS apostles) and the mission of HIS Church.
This is why the most the Church will say about any vision, practice, association, devotion, etc associated with a private revelation is that it is 'worthy of belief'
It like an imprimateur on a book, it says 'there is nothing here contrary to the faith' and one is free to use it to deepen ones walk..
None of the faithful are required to follow, believe or practice these private revelations, but neither are we to pass judgement on our brothers and sisters for doing so (even if we think they're kind of loopy

)
As a result of this, we have an abundent diversity of communities, devotions, associations etc.. All working together to share the Gospel with the world around us..
And all 'bearing with one another in love' coming together with one voice, and one heart, and one mind to worship and praise our Father through our Lord and Saviour, Jesus Christ, in the unity of the Holy Spirit.
You too are welcome to come to the wedding feast of the Lamb of God!
Peace be with you!