The central message of this sermon is that when we disagree on non-essential matters in our faith, we must learn to live with and accept each other's differences without judgment or condescension. This requires recognizing that others' "scruples" or personal convictions are between them and God, not for us to dictate or judge. The speaker highlights the importance of humility and understanding in dealing with disagreements, rather than trying to impose our own standards on others. By doing so, we acknowledge that each person has a unique relationship with God and must answer to Him alone for their choices. This message advances the belief that Christianity is not about strict adherence to rules or external expectations, but about personal faith and relationship with God. The takeaway the teacher wants the listener to understand is that accepting and loving others in their differences is a vital aspect of living out our Christian faith, even when we disagree on non-essential matters.