Talkative is apt to be a shallow fellow, and to say foolish things about matters he only half understands, and yet he has his place in society.
 Oliver Wendell Holmes Sr., Over the Teacups (1891). copy citation

Context

““things heavenly or things earthly; things moral or things evangelical; things sacred or things profane; things past or things to come; things foreign or things at home; things more essential or things circumstantial.” Talkative is apt to be a shallow fellow, and to say foolish things about matters he only half understands, and yet he has his place in society. The specialists would grow to be intolerable, were they not counterpoised to some degree by the people of general intelligence. The man who knows too much about one particular subject is liable to become a terrible social infliction.” source