These things are the frivolous part of study (which is why I also tell you that the men are jesting); and I call these things 'frivolity' because even if a man were to learn many or even all such things, he would be none the wiser as to how matters stand but would only be able to make fun of people, tripping them up and overturning them by means of the distinctions in words, just like the people who pull the chair out from under a man who is going to sit down and then laugh gleefully when they see him sprawling on his back.