Philosophy of grammarians and understanding mantra.

I would like to understand the philosophy of the grammarians. I think their philosophy is important for understanding the concept of”mantras”.

TO UNDERSTAND THE CONCEPT OF MANTHRAS ONE NEEDS GURU’S UPADE:SAM BUT NOT THE PHILOSOPHY OF GRAMMARIANS. THAT LEADS TO MORE COMPLICATIONS RATHER THAN DEVELOPING DEVOTION TOWARDS THE MANTHRA.