 At the end of the 18th-century the "Enchiridion" is attested in the personal libraries of Benjamin Franklin and Thomas Jefferson.In the 6th-century the Neoplatonist philosopher Simplicius wrote a huge commentary on the "Enchiridion", which is more than ten times the bulk of the original text.Chapter after chapter of the "Enchiridion" is dissected, discussed, and its lessons drawn out with a certain laboriousness.