Plato, 7, 12, 64. Plotinus, 11, 12, 117. Porphyry, 12. Poverty, 36 ff. Predestination, 4, 6, 36, 98. Pre-existence of the soul, 15, 64, 116. Proclus, 12. Prophet, the. _See_ Mohammed, the Prophet. Prophets, the, 121, 122, 126, 129, 164. Purgative Way, the, 32. Pythagoras, 64. Qadarites, the, 6. Qadīb al-Bān, 144. _qalb_, 50, 68. Qays, 105. _qibla_, 134. Quietism, 4. _See_ Trust in God. Qushayrī, 126, 130. _Qutb_, 123, 124, 164, 165. Rābiʿa, 4, 31, 115. _rāhib_, 10. Raqqām, 107. Reason, the Active, 151. Recollection, 36, 45. See _dhikr_. Religion, all types of, are equal, 87. Religion, positive, its relation to mysticism, 24, 71 ff. _See_ Islam, relation of Sūfism to. Repentance, 30 ff. _ridā_, 41. Rizwān, 161. Rosaries, used by Sūfīs, 17. _rūh_, 68. Rūmī, 153. _See_ Jalāluddīn Rūmī. Ruysbroeck, 151, 164. Sābians, the, 14. Saʿduddīn of Kāshghar, Mawlānā, 142. Safā, 92. Sahl ibn ʿAbdallah of Tustar, 46, 52, 56, 63, 130. Saints, the Moslem, 120 ff. Saintship, the doctrine of, 62, 120 ff. Salāmān, 116. _sālik_, 28. _samāʿ_, 59, 60, 63 ff. Saqsīn, 161. Sarī al-Saqatī, 52, 54, 61, 113. Satan, 32, 113. _See_ Devil, the. _Sea, the Revelation of the_, by Niffarī, 74. Self-annihilation, 140, 141, 168. See _fanā_. Shāh al-Kirmānī, 52. Shaqīq of Balkh, 42, 43, 44. Sheykh, the, 32 ff., 49, 140, 141. _See_ Directors, spiritual. Shiblī, 34, 35, 48, 52, 55, 62, 116. Shihābuddīn Suhrawardī, 166. Shīʿites, the, 89. _shirb_, 59. _siddīq_, 14. Sin, 30 ff. Singing, 63 ff. _sirr_, 68, 155. Soul, the lower or appetitive. See _nafs_. Spirit, the divine, 150, 151. Spirit, the human, 51, 68. Stages, mystical, 28 f., 41. States, mystical, 29. Stephen Bar Sudaili, 12. Sūfī, meaning and derivation of, 3. Sūfism, definitions of, 1, 14, 25 ff. Sūfism, the oldest form of, 4 f. Sūfism, the origin of, 8 ff. Sūfism, its relation to Islam, 19 ff., 71 ff., 86 ff., 159, 160. _sukr_, 59. Sunna, the, 73. Symbolism, mystical, 28, 102 ff., 116, 117. _tālib_, 29. _tarīqat_, 27, 28. Tauler, 151. _tawajjuh_, 142, 143. _tawakkul_, 41. Tawakkul Beg, 141, 142. Telekinesis, 145. Telepathy, 120. See _firāsat_. _Theology of Aristotle_, the so-called, 12. Tirmidh, 143. Tora, the, 105. Traditions of the Prophet, 23, 39, 44, 49, 51, 53, 54, 68, 80, 83, 100. Transoxania, 16. Trust in God, 36, 41 ff. Truth, the, 29, 30, 79, 92 ff., 152, 163. Underhill, E., 164. Union with God, 39, 159, 160. _See_ Unitive State, the, and _fanā_. Unitive State, the, 148 ff. Unity, the divine, Sūfistic theory of, 42, 79 ff., 98, 152, 154, 155. Vedānta, the, 18. Veils, the seventy thousand, doctrine of, 15 f. Vision, spiritual, 50. _wajd_, 59. _walī_, 122, 123. _See_ Saints, the Moslem. _waliyyat_, 123.