The author tells the addressee that he should not worry so much about something that he doesn't explicitily describe, but that seems related to the silk trade.
Gaspar Díaz, a maker of shell boxes, was the defendant in this case of Judaism. He was accused in 1700 by the Cuenca Inquisition. It is not clear why this letter was filed among the documents of his proceedings.
If there is no translation for the letter itself, you may copy the text (while using the view 'Standardization') and paste it to an automatic translator of your choice.