Be not deceived by the tempting rewards of dishonest achievement; be willing to toil for the later returns inherent in honest endeavor.  The early traders were scrupulously honest within their own tribes but regarded it as all right to cheat distant strangers. 
Jesus’ advice to rich man on wealth derived from fraud: If any portion of your fortune has been knowingly derived from fraud; if aught of your wealth has been accumulated by dishonest practices or unfair methods; if your riches are the product of unjust dealings with your fellows, make haste to restore all these ill-gotten gains to the rightful owners. Make full amends and thus cleanse your fortune of all dishonest riches.  Secrecy has always been essential to the successful practice of fraud and superstition.