Notwithstanding the spinners who carded the strands well and spun out very fine yarn, accumulated wealth. O mother! I must admit that personally I never spun such a fine yarn at any time in my spinning yard. (This implies an admission that the seeker seldom performed an act of singular merit in his life).
Note: (1) Single thread yarn may imply monotheism or sharah.
(2) The spinners contemplated in this verse, are an exception to the general rule. They seem to work directly under the Divine guidance and as such their product is excellent.

Those, who spun alone amassed wealth, o mother,
Fine fiber like their's is not being spun by me?