Mysticism is such a vital element in Islam that without some understanding of its ideas and of the particular forms which they assume it is hard to penetrate below the surface of Muslim religious life. In this book, which was first published in 1921, Professor Nicholson examines the life, work and teaching of three of the most important of the early Súfís - the Persians Abú Sa'íd (937–1049) and Al-Jílí (1365–1406), and the Cairene Arab Ibnu l-Fárid (1182–1235). These great mystics were almost legendary figures; possessors of occult and mysterious powers, whose tombs became holy shrines. They were regarded in effect as saints, but saints canonised by the people while still living, not posthumously by the church. Súfism, as Professor Nicholson suggests, lies at the heart both of the religious philosophy and the popular religion of Islam.
Reynold Alleyne Nicholson, was the greatest Rumi scholar in the English language. He was a professor for many years at Cambridge Universtiy, in England. He dedicated his life to the study of Islamic mysticism and was able to study and translate major sufi texts in Arabic, Persian, and Ottoman Turkish. That a Western scholar of "the first rank" dedicated much of his life to the study and translation of Rumi's poetry was very fortunate.
His monumental achievement was his work on Rumi's Masnavi (done in eight volumes, published between 1925-1940). He produced the first critical Persian edition of Rumi's Masnavi, the first full translation of it into English, and the first commentary on the entire work in English. This work has been highly influential in the field of Rumi studies, world-wide. His critical Persian text has been re-printed many times in Iran and his commentary has been so highly respected there, that it has been translated into Persian (by Hasan Lâhûtî, 1995).
Nicholson also produced two volumes which condensed his work on the Masnavi and which were aimed at the popular level: "Tales of Mystic Meaning" (1931) and "Rumi: Poet and Mystic" (1950).
His earliest translations of selected ghazals from Rumi's Divan ("Selected Poems from the Díváni Shamsi Tabríz," 1898) has been superceded by A. J. Arberry's translations ("Mystical Poems of Rumi," 1968; "Mystical Poems of Rumi: Second Selection," 1979), in that Arberry used a superior edition of the Divan (done by Foruzanfar). Arberry re-translated all of the ghazals previously translated Nicholson (his teacher and predecessor at Cambridge University) based on the superior edition, minus seven ghazals which were not in the earliest manuscripts of the Divan (and therefore are no longer considered by scholars to be authentic Rumi poems (Nicholson's numbers IV, VIII, XII, XVII, XXXI, XXXIII, and XLIV).