My wife and I have read their books. Our conclusion, (we've been married 24 years, and are still raising our 12 children) is that you're better off studying the 4 temperaments and applying that information to the training and disciplining of your children. It is my understanding that most traditional Catholic seminaries, and teaching sisters of old, studied and applied this information as a means of better understanding each person, his strengths and weaknesses and how to form them properly, and completely. A soul properly formed is more willing to seek out is proper end.
Knowledge of the temperaments also is greatly helpful in dealing with your spouse, aiding in marital unity, which also aids in the raising of the children.
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This is essentially what we do now. (temperament based training/discipline). I like how you've said it... "A soul properly formed is more willing to seek out its proper end." Well put!
We started (and finished) the first Pearl book we were given today and took notes. Fundamentally, it is a behavior modification manual designed to get children to obey, with the primary methods being different forms of physical punishment. The fundamental goal of the different punishments they recommend is to break the child's will so that they do not resist you.
Obviously with very small children, a great deal of obedience training is done through behavior modification because those children do not yet have reason. But I would be very concerned if one's approach to character formation, discipline, etc. was based on the material in this book. The authors by no means restrict the method only to pre-rational children.
Never is the prudence of the parent invoked (virtue, as a concept, is I think entirely absent from the book). Denied is the possibility that different children require different approaches. The authors emphasize the importance of breaking (not molding) children's wills. The idea of warnings, second chances, and mercy are absent from what I can tell. With some frequency, the authors compare child rearing to the training of farm animals. These analogies, along with their methods, go to show that a very materialist-behaviorist philosophy is informing the methods in question.
None of the faculties of the soul are accounted for by the authors, and as such, I would not expect the advice in this book to contribute to intellectual or moral development at all. I think it will be very effective in simulating a well-raised child, because the consistent application of the kinds of punishments described therein will make children terrified of disobedience (this is appropriate for very small children I think). As such, children raised this way will likely do as they are told. They will learn not to show the slightest sign of resistance or hesitation, since these are punished alongside actual disobedience.
I think, among other things, a major risk run by relying on these methods is that when such children are adults, they will be unable to make their own decisions (instead, looking for their parents to tell them what to do). I noticed that, in fact, all of the Pearls' children are employed by the Pearls. This of course makes perfect sense. If their parents' fundamental goal in raising them was to break their wills, how can they be expected to do things on their own or for themselves? For girls called to marriage this is not as big a problem, but for boys it can be devastating, turning them into grown men who need their parents' say-so and validation with every decision.
Honestly, I think that people raised by a book like this are exactly the kinds of people who would buy a book like this. There are no principles to interpret or apply. Good judgment, prudence, wisdom, etc. are irrelevant. Just do what the book says.
I am still processing and considering the information in the book. I may have more to add later.