BG 9.2
राजविद्या राजगुह्यं पवित्रमिदमुत्तमम् ।
प्रत्यक्षावगमं धर्म्यं सुसुखं कर्तुमव्ययम् ॥
प्रत्यक्षावगमं धर्म्यं सुसुखं कर्तुमव्ययम् ॥
rāja-vidyā rāja-guhyaṁ pavitram idam uttamam
pratyakṣāvagamaṁ dharmyaṁ su-sukhaṁ kartum avyayam
pratyakṣāvagamaṁ dharmyaṁ su-sukhaṁ kartum avyayam
Word-for-word meanings
idam — this [knowledge of devotion]; rāja-vidyā — [is] the king of wisdom; rāja-guhyam — the king of secrets; uttamam — supremely; pavitram — purifying; avagamam — cognized; pratyakṣa — through immediate intuition; dharmyam — intrinsically of the nature of dharma; su-sukham — very easy; kartum — to practice; avyayam — [and] imperishable.
Translation
This knowledge [of devotion] is the paramount wisdom, the king of secrets, supremely purifying, cognized through immediate intuition, intrinsically of the nature of dharma, easily undertaken, and imperishable.