“a jack of all trades is a master of none” is a figure of speech used in reference to a person that is competent with many skills, but spends so much time learning each new skill that they can not become an expert in any particular one.

The earliest recorded versions of the phrase do not contain the second part. Indeed, they are broadly positive in tone. Such a Jack of all trades may be a master of integration, as such an individual knows enough from many learned tr