Read it through once

"Indeed, sir, I cannot tell; mother forbade it. Laurie has confessed, asked pardon, and been punished quite enough. We don't keep silence to shield him, but some one else, and it will make more trouble if you interfere. Please don't; it was partly my fault, but it's all right now; so let's forget it, and talk about the 'Rambler,' or something pleasant."