Yep - it works even better with quinces than with apples. That is why quinces used to be so common.
Gooseberries work well too, although they need to be lightly crushed before boiling.
The most intelligent people seem capable of holding schizophrenic beliefs, or disregarding plain facts, of evading serious questions with debating-society repartees, or swallowing baseless rumours and of looking on indifferently while history is falsified. All these mental vices spring ultimately from the nationalistic habit of mind, which is itself, I suppose, the product of fear and of the ghastly emptiness of machine civilization.