It is taken from Charbon-neaux-Lassay’s very fine book: Le bestiaire du Christ. “People used to think that the hoopoe bird could hide entirely from the sight of all living creatures, which explains the fact that, at the end of the Middle Ages, it was still believed that there was a multicolored herb in the hoopoe’s nest which made a man invisible when he wore it.”
“Hu,” the aspirant, breathy sound made at the end of the word Allah, is a sound that is hidden as a divine Name within each recitation of Allah. The relationship that Allah and Hu have with each other describes the nature of ecstasy. It does so by conveying that there is a secret within the secret. The subtle way the sound “Hu” arises at the end of the invocation “Allah” also suggests an infinite process of essence of essence of essence…
– physicians of the heart, p. 190
Edge of Atlantic 