union of the individual soul with God, and all is good which helps towards this, all is evil which retards it, and this is true of Christian and all other forms of mysticism equally. We cannot say definitely that the doctrine of the unitive state is borrowed from neo-Platonism, from Buddhism, or from Gnosticism; it is the common property of all, and is the natural conclusion from the mystics premises as to the nature of God and of the human soul. It may well be that certain presentations of this doctrine show Indian details, but in this as in all other parts of Sufi speculation it seems that the constructive theory employed in forming a theological system was neo-Platonic: even in mysticism the Greek mind exercised its influence in analysing and constructing hypotheses.
At quite an early age the soul's desire for union with its Divine source began to be clothed in terms borrowed from the expression of human love. With some hesitation we may say, perhaps, that this is distinctly oriental, although it was so only as a means of expressing a desire which is characteristic of all mysticism. We find the same, at a later period, though in a much more restrained fashion, in Christian mysticism, and it is not easy to see the actual line of contact, if any. Perhaps we must be content to regard it as independently developed as a means of expressing the soul's longing.
The rise of Sufi teaching was not without opposition, and this was mainly on three grounds (i.) the Sufis advocated constant prayer in the form of unceasing
