The MANTRA is a formulated realisation in words of a Rishi's spiritual eminence. What is spiritually mature in our inner being, finding verbal expression is a mantra. A mantra will serve fully one who has discovered it. To others, such as disciples who accept him as guru, the mantra has a great use value. A physicist uses a telescope or a chemist uses a microscope. They may not know the construction of the tool they ably use with scientific relish. Disciples use mantras with felicity.