Śrī Rudram is considered as the heart of Kṛṣṇa Yajur Veda, because Śrī Rudram occupies the central part of Kṛṣṇa Yajur Veda. Out of entire Śrī Rudram, नमःशिवाय (namaḥśivāya), the Pañcākṣara mantra occupies the central point. Śrī Rudram is also known as Rudra Upaniṣad. It is called so because, recitation of Śrī Rudram removes our vāsanā-s (the impression of anything remaining unconsciously in the mind, the present consciousness of past perceptions), by imparting higher spiritual knowledge like Upaniṣad-s. It is also said that gods are satiated if Śrī Rudram is chanted and hence it is also called Śatarudrīya, which means one hundred ways of glorifying Rudra. If a tree is watered regularly, it grows with huge foliage. Similarly, if Śrī Rudram is chanted, all gods are pleased. Further, recitation of Śrī Rudram is considered as a remedy for all types of sins. References are available in certain Upaniṣad-s about...