As far as we can trace, we find that since the time of Abraham there have been esoteric schools; many of them were called Sufi schools. The Sufi schools of Arabia had a more metaphysical Arabic culture; the Sufi schools of Persia developed the literary aspect; the Sufi schools of India developed the meditative faculty. But the truth and the ideal have remained the same as the central theme of Sufism in all these schools. Different schools have been called by different names, but all are considered Sufi schools. These schools exist even now, and it would not be an exaggeration to say that there are millions of souls of the followers of different religions who benefit by the wisdom of these schools.