Hardly anyone would understand me if I spoke of Dar-es-Salam, but if I say "Jerusalem" everyone can. We see how true this is when we study some words of the Bible. "Alleluia", for instance, is really "Allahu". The order of the letters is changed, and this makes it seem a different word; the spelling is altered because different countries spell their words differently. The vowels and the vibrations, therefore, change to a certain extent, and so the mystics prefer, when possible, to adhere to the original form of the word. It is not because it belonged to a certain language of the past, but because there is actually more benefit to be obtained by using the word in its original form.