“Doesn’t make it right,” said Jem stolidly. He beat his fist softly on his knee.
“You just can’t convict a man on evidence like that – you can’t.”

– Harper Lee

To Kill a Mockingbird, Chapter 23. Jem is finding it difficult to come to terns with Tom Robinson’s guilty verdict. He is angry at the injustice of a man being conficted because of the color of his skin, even though the evidence suggested he was innocent.