The "Song of the Free", a classic text of Advaita Vedanta expresses the highest experience of the unfettered Self. Sanskrit text, transliteration and English translation. One of the purest statements of the supreme knowledge of Advaita, by a sage who lived over three thousand years ago.
The disciple must have great power of endurance. Life seems comfortable; and you find the mind behaves well when everything is going well with you. But if something goes wrong, your mind loses its balance. That is not good. Bear all evil and misery without one murmur of hurt, without one thought of unhappiness, resistance, remedy, or retaliation. That is true endurance; and that you must acquire.
-Swami Vivekananda