The central message of this sermon is that people often become so bound up in their own assumptions, interpretations, and rules that they lose sight of the true purpose and meaning behind them. This is illustrated through the story of Jesus healing a blind man on the Sabbath, where the Pharisees are more concerned with accusing Jesus of breaking their rules than with understanding the significance of the miracle itself. The sermon suggests that this phenomenon is not unique to the Pharisees, but rather it's a common human tendency to get bogged down in details and lose sight of the bigger picture. This theme advances the belief that true spiritual growth and understanding require a willingness to let go of assumptions and preconceptions, and to approach life with humility and openness. The sermon also implies that this is not just a personal issue, but rather it's a fundamental aspect of human nature that can be observed in various areas of life, from religion to business to family traditions. Ultimately, the sermon invites listeners to reflect on their own tendencies towards rigidity and close-mindedness, and to seek a more nuanced and flexible approach to understanding and living out their faith.