"Regarding your question no. 4, Gayatri mantra means it is chanted by a qualified Brahmin. A devotee of Krishna is understood to have surpassed the stage of becoming qualified Brahmin, so Gayatri mantra can be chanted by qualified Brahmin, and the meaning of Gayatri mantra is Gayat—Gayat means sin, and tri means deliverance.Gayatri. And mantra, man—means mind, tra means deliverance. So the things chanting which one is delivered from the mental platform is called Gayatri mantra, or mantra. So all mantras are like that, but this is the meaning of Gayatri mantra."