Hello,
One of the requirements to receive a particular indulgence when praying rosary with a group at the Church is to pray aloud - I got this information from back of a praying card, but I don’t have it with me.
I recall hearing that, and it is one thing that makes me wonder if silently and mentally praying the Rosary is okay.
One thing I wonder is, if only God can read my mind, how can anyone even a saint in heaven read it? LIke if I am talking to Mary, shouldn’t I be speaking out loud? is this what you are wondering as well, JMJ_coder? Hopefully someone on here will answer because this has been a question of mind for a while, as well.
No, God enlightens the Saints to what they need to know. They don’t need to hear the sound waves reverberate in their eardrums to get the message we send them.
There are some practical considerations on both sides. By saying the Rosary aloud, it completely frees the mind for contemplation of the Mysteries. The prayers then become a timer for how long you will spend on each Mystery. It is sort of like the Desert Fathers, who would mindlessly weave baskets. They were 1.) dong manual work and providing for their existence and 2.) completely freeing their minds, by not having to think about the mindless, monotonous, repetitive work at their hands, to complete dedicate themselves to ceaseless prayer.
Saying the Rosary aloud almost ensures that all the prayers are said. I have caught myself, when I pray mentally, saying the first part of the Hail Mary on one bead, and saying the second part on the next bead. This was unintentional, but my mind just wandered (as any Spiritual Father will attest can happen quite easily in prayer).
Saying the Rosary silently, though, would allow it to be said anywhere - in the grocery line, at the butcher’s, on the golf course, waiting for a play to begin, etc.
I guess, perhaps, it is best to pray the Rosary aloud in Church or in private and silently when in public or would disturb someone at Church.
Perhaps the Rosary could be more easily said completely silently the further along in the spiritual life one progresses.