Those who have demonstrated poor business judgment should not be consulted about business

He who has shown poor judgement in conducting his own business will never give wise counsel about the business of others. Isocrates. To Demonicus. Speech 1. Section 35.

Image: The Battle of Actium 2 September 31 BCE by Flemish painter, Lorenzo A. Castro, 1672. Now part of the collections of the National Maritime Museum in Greenwich, London. Image courtesy of Wikimedia Commons.