“Yes we cannot afford to be not precise”
Certainly some precision and one-pointedness is needed in the work of the expansion of consciousness. But if you mean by “precise” as in clinging to a certain one-sided understanding as to how things should be, then that is as far away from having any amount of clarity as possible. If you look in certain traditions, they will say that there are 72,000 nadis in the subtle body. If you look at other traditions, they will say that there are 300,000 nadis in the subtle body. Some will say that Ajna chakra is indigo, others will say that it is orange. Some will say that the three primary nadis - the ida, the sushumna, and the pingala, all originate frmo the manipura. Others will say that they originate from the muladahara. You have to understand that all of these various models have been created, not for you to grasp onto them as though they were absolutes, but just to help assist you in accessing your own inner dimension - they are methods for awakening different aspects of your own consciousness. Whether you are concentrating upon a mantra in Pali, or Sanskrit, or Prakrit, or Hebrew, that is not the essential phenomenon. What is essential is that you create a whole range of correspondences and associations in the mind. That is how a symbol - which means nothing in itself, suddenly becomes an instrument for transformation. The moment the mind creates a link between a symbol and an idea, now that symbol becomes a representative of that idea. So this whole system has come into being as an effort to assist you in awakening different aspects of the energy of your own consciousness. “Precision” as in having an attachment to a particular model, is not the kind of precision that is needed. What is needed is that whatever model you are using - you use it with a certain amount of dedication, one-pointedness of attention, and intensity.