The vast majority of mantras have been a part of a Stotra or an Upanishad or a fullfleged Sadhana or an Anushthana and were being never meant to be Utilized in isolation. Nonetheless, over a period of time, a lot of the Pundits started compiling the mantras and formulated books https://lombok-directory.com/listings13290152/world-famous-tantrik-an-overview