The disciples still had a lot to learn about their Master and about humility. Attaining spiritual riches requires that we be wholly invested in something other than the physical.
Jesus taught that people need a genuine change of heart to solve their problems. Only then will they recognize those things that are truly important in life.
Augustine’s writings on original sin are often seen as a reaction to his own perceived youthful sexual excesses. In reality, his views are rooted in philosophy.