Sri Vidya mantra is to be initiated by the teacher to the disciple who is found to be suitable for the initiation. There are many reasons for this but the simplest reason is that, we are dealing with infinite energies here. This is not a joke. We are not talking about fiction.
We are talking about ‘Parashakthi‘–the infinite energy of which electricity, gravity and magnetism are derivations. So, we are talking about the sum total of all energies. And that resides in a small way, of course, as the Kundalini in the Mooladhara chakra of all human beings. Now to arouse this energy without proper preparation would be disastrous. I know of cases where this has happened.
The body and the mind should be made fit enough to take the shock of the awakening of this energy. This is why some of the techniques of Sri Vidya, for instance, or many others are kept secret. It is not because somebody is jealous that you would learn it but because it could be dangerous in the wrong hands.
In fact, my Master Maheshwarnath Babaji, said that to teach Sri Vidya to someone, whose mind has not been purified and who is not mature enough to take the right decisions, is like putting a child in a room full of dynamite, and giving the child a match box. You know what the result will be.