"The Musalmans have no missionary labours to record… We find no trace of any missionary movement for converting non-Muslims. Medieval Islam was a converting creed, but it failed to develop any missionary activity… So far as our country is concerned we have to confess frankly that no trace of a missionary movement for the conversion of non-Muslims has yet been discovered. ... Some cheap mystic books now current attribute conversions to Muslim mystics on the basis of miracles they performed. So in order to believe in the conversions one has to believe in the miracles also. But all such books will be found on examination to be latter-day fabrications."
January 1, 1970
https://en.wikiquote.org/wiki/Sufism_in_India