Appreciate joy. Do not indulge overzealous joyous behaviors. This is a pitfall of the young and inexperienced. Nurture the inner source of that joy and turn it into blessings rather than simple mirth.
The text reads:
True joy must spring from within. But if one is empty within and wholly given over to the world, idle pleasures come streaming in from without. This is what many people welcome as diversion. Those who lack inner stability and therefore need amusement, will always find opportunity of indulgence. They attract external pleasures by the emptiness of their natures. Thus they lose themselves more and more, which of course has bad results.