Those who would use alchemy to make gold from dust,The poem seems to suggest that the embellishment of the dust, of which the bricks are made, is turned to gold by the embellishment of the tiles and the calligraphy. This is further alluded to in a quotation from the Quran, which is possibly by Iusef's father, and which is placed immediately below it.
Will they look at us from the corner of their eyes?
From the humble work of Iusef, son of Taj Al Din, builder of Isfahan
Click here to see the second inscription:
This is a reference to Chapter 7 ('The Elevated Places'), v.31 of the Quran which reads "O Children of Adam! wear your beautiful apparell at every time and place of prayer", and is probably intended as a justification for the embellishment of the mosque. The small letters at the bottom right hand corner of the inscription, shown smaller in the image above, imply that this was the work of 'Taj Al-Din' who describes himself as an 'Isfahani Teacher'. It may well be that he was the father referred to in the earlier inscription.