The Royal Science — Raja Vidya Guhya Yoga
Chapter 9 of Bhagavad Gita by Vyasa
Now will I open unto thee--whose heart Rejects not--that last lore, deepest-concealed, That farthest secret of My Heavens and Earths, Which but to know shall set thee free from ills,-- A royal lore! a Kingly mystery! Yea! for the soul such light as purgeth it From every sin; a light of holiness With inmost splendour shining; plain to see; Easy to walk by, inexhaustible!
They that receive not this, failing in faith To grasp the greater wisdom, reach not Me, Destroyer of thy foes! They sink anew Into the realm of Flesh, where all things change!
By Me the whole vast Universe of things Is spread abroad;--by Me, the Unmanifest! In Me are all existences contained; Not I in them!