My beloved children, who are the pupils of my eye—Truth is silent. If Truth has dawned within you, then there will be no further speech. It is silence, and silence is the greatest Truth, the best question. If there is no Truth, then there will be a lot of talk and questions. One is good and the other is bad. If there is good within you, there will be no further noise within. But if you are full of bad, there will be so much of talk, speeches and questions. Therefore, seek the good. God does not make a noise. If you need anything, then you will have only to knock, and if you are tuned to that point, with the sound of that knock you will get an answer immediately. No noise, you don't have to make a sound. This is the Truth.
(Shaykh M. R. Bawa Muhaiyaddeen)
'The Mystics of Islam'
By Reynold A. Nicholson (Author)
Long considered one of the classic texts in the field respected by both scholars and those ... interest[ed] in [Islamic] mysticism.
Nicholson's Mystics of Islam was the first book in the West to offer a lucid ... sympathetic picture of Islamic mysticism.