राजविद्या राजगुह्यं पवित्रमिदमुत्तमम्। प्रत्यक्षावगमं धर्म्यं सुसुखं कर्तुमव्ययम्
rāja-vidyā rāja-guhyaṁ pavitram idam uttamam pratyakṣhāvagamaṁ dharmyaṁ su-sukhaṁ kartum avyayam
This is the supreme science, the supreme secret, the purest and best; it is intuitive, righteous, and to those who practice it, it is exceedingly pleasant.
Translated by Shri Purohit Swami
This is the royal science, the royal secret, the supreme purifier, realizable by direct intuitive knowledge, according to righteousness, very easy to perform and imperishable.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
rāja-vidyā—the king of sciences; rāja-guhyam—the most profound secret; pavitram—pure; idam—this; uttamam—highest; pratyakṣha—directly perceptible; avagamam—directly realizable; dharmyam—virtuous; su-sukham—easy; kartum—to practice; avyayam—everlasting