These mantras are termed as ‘Swayam Siddhi’ mantras. It means that you don’t want any sadhna to invoke their powers. The Shabar Mantra is immensely powerful as it lacks the Keelak. The phrase keelak refers to the limit. Keelak is a barrier that seals a Mantra's power and can https://www.youtube.com/watch?v=nDcLbHwNpE8&t=8s