This quote suggests that while there are many marriages that function well and are generally considered "good," there are very few that are truly "delightful" or filled with consistent joy, pleasure, and satisfaction. The difference between "good" and "delightful" here is significant. A "good" marriage might be defined as one that meets basic standards of mutual respect, loyalty, and compatibility. However, a "delightful" marriage would go beyond these basic standards, offering a deep sense of joy, fulfillment, and mutual growth.

Applying this idea in today’s world, it could be seen as a commentary on the nature of relationships and the societal expectations placed on them. Many people enter into marriages with the expectation that it would be not just good, but delightful. When reality does not meet these expectations, it could lead to dissatisfaction and disillusionment.

In terms of personal development, this quote could be a reminder that achieving a delightful marriage or relationship requires more than just meeting the basic standards. It requires continuous effort, deep understanding, and mutual growth. It’s about striving for more than just ‘good enough’, but aiming for delight and deep satisfaction in a relationship. This could involve open communication, mutual respect, shared goals, and a commitment to keep the relationship exciting and fulfilling.

In essence, the quote invites us to reflect on our relationships and consider how we can move beyond just being ‘good’ and strive for ‘delightful’. Whether that’s through more open and honest communication, shared experiences, or continuous personal growth, it’s a reminder that relationships can and should be a source of great joy and fulfillment.