The central message of this sermon is that true spiritual sight and understanding can only be achieved by acknowledging and submitting to God's sovereignty, rather than clinging to human traditions and regulations. The Pharisees' rigid adherence to their rules and expectations blinded them to the reality of Jesus' presence and mission, while the man born blind was healed precisely because he did not have a preconceived notion of how things should be done. This contrast highlights the idea that spiritual growth and sight are not achieved by following a set of external rules or expectations, but rather by surrendering to God's will and purpose. Ultimately, the sermon suggests that the Pharisees' obstinacy and refusal to submit to Jesus ultimately led them to spiritual blindness, while the man born blind's humility and openness allowed him to receive true sight and understanding.