In this quote, M. Scott Peck is suggesting that discipline and knowledge are carefully intertwined and can even be seen as interchangeable. This implies that the act of being disciplined, or having self-discipline and following a set of rules or principles, can lead to knowledge. Likewise, wisdom, which is the ability to make great judgments and have a deep understanding of life, can likewise lead to discipline. This quote highlights the concept that discipline is not practically following guidelines, however it is also about developing a much deeper understanding of oneself and the world. It suggests that through discipline, one can acquire knowledge and through knowledge, one can end up being more disciplined.
"Raising children is an incredibly hard and risky business in which no cumulative wisdom is gained: each generation repeats the mistakes the previous one made"
"The man who makes everything that leads to happiness depends upon himself, and not upon other men, has adopted the very best plan for living happily. This is the man of moderation, the man of manly character and of wisdom"