rāja-vidyā rāja-guhyaṁ pavitram idam uttamam
pratyakṣhāvagamaṁ dharmyaṁ su-sukhaṁ kartum avyayam||2||

Meaning : This is the king of knowledge and the king of secrets. It is the purest, most excellent, directly experienced, in harmony with dharma (righteousness), easy to practice, and imperishable.