Where is the quote the one thing that doesn't abide by majority rule is a man's conscience?

The quote "The one thing that doesn't abide by majority rule is a man's conscience" is from Harper Lee's novel "To Kill a Mockingbird." It reflects the theme of individual moral integrity in the face of societal pressures and the importance of personal convictions. The statement emphasizes that one's sense of right and wrong cannot be dictated by the opinions of the majority.