Christian scholars often say that Sufi theories are close to those of Christianity. Many Moslems maintain that they are essentially derived from Islam. The resemblance of many Sufi ideas to those of several religious and esoteric systems are sometimes taken as evidence of derivation. The Islamic interpretation is that religion is of one origin, differences being due to local or historical causes.
Idries ShahThere is a Persian proverb: 'To test that which has been tested is ignorance.' To try to test something without the means of testing is even worse.
Idries ShahBetter to be safe than to be sorry' is a remark of value only when these are the actual alternatives.
Idries Shah