(1) If you're ever able to pour wine into some family's wineskin, one of four things will happen. Three of these possible outcomes look just the same for all outward appearances. Attempting to cause the most telling result is not recommendable.
(2) If a wineskin's owners are cautious about who gets to refill it, then pouring in new wine is most likely not recommendable.
(3) There are two ways to preserve an old wineskin. Every old wineskin owner prefers the first method. The question is, what to do when the old wine runs out.
(4) There's only one way a family can keep having new wine, but it's costly. Each new wineskin requires the sacrifice of at least one suitable hide.