Adam Clarke on Proverbs 3:14

For the merchandise - סחר sachar, the traffic, the trade that is carried on by going through countries and provinces with such articles as they could carry on the backs of camels, etc.; from סחר sachar, to go about, traverse. Chaffarynge; Old MS. Bible.

And the gain thereof - תבואתה tebuathah, its produce; what is gained by the articles after all expenses are paid. The slaves, as we have already seen, got their liberty if they were so lucky as to find a diamond of so many carats' weight; he who finds wisdom - the knowledge and salvation of God - gets a greater prize; for he obtains the liberty of the Gospel, is adopted into the family of God, and made an heir according to the hope of an eternal life.