Acts 9:3

He was near to Damascus before this wonderful vision, that, being struck blind, he might be the sooner led thither; as also, that the miracle might be more easily and publicly known, Damascus being the chief city of Syria; and, though about six days journey from Jerusalem, inhabited by many Jews. This was done at noon day, the rather, that the light which Paul saw might appear to be beyond that which the sun gives; and this light was a symbol of that inward light, wherewith his mind was now to be enlightened; as also of the purity of the doctrine he was to preach, and holiness of his life which he was to lead; and most probably it was caused by the glorified body of Christ, which appeared unto him.