That is not the only thing. There is more in it. The power that comes through these electrical words of the mantras, can also give you a shock because you may not be properly insulated. Only when it comes from the guru, it gets properly secreted within bounds; if it exceeds the bounds, that is if the insulation is not there, it will only burn you !
My own suggestion to book-writers is that when they publish such things, let there be a popular edition which avoids the profound matters of mantra secret. And let there be a limited circulation book which does get into those secrets, but such ‘classified’ books must be made available only with the authorization of the proper guru. I think, from my platform, it is my duty to say this.