"Know the truth and be free in a moment." All the darkness will then vanish. When man has seen himself as one with the Infinite Being of the universe, when all separateness has ceased, when all men and women, an gods and angels, all animals and plants, and the whole universe have melted into that Oneness, then all fear disappears. Can I hurt myself? Can I kill myself? Can I injure myself? Whom to fear? Can you fear yourself? Then will all sorrow disappear. What can cause me sorrow? I am the One Existence of the universe. Then all jealousies will disappear; of whom to be jealous? Of myself? Then all bad feelings disappear. Against whom can I have bad feeling? Against myself? There is none in the universe but I. And this is the one way, says the Vedantist, to Knowledge. Kill out this differentiation, kill out this superstition that there are many. "He who in this world of many sees that One, he who in this mass of insentiency sees that one Sentient Being, he who in this world of shadows catches that Reality, unto him belongs eternal peace, unto none else, unto none else."
- Swami Vivekananda
The Complete Works of Swami Vivekananda/Volume 2/Jnana-Yoga/The Atman