"You're thinking about something, my dear, and that makes you forget to talk. I can't tell you just now what the moral of that is, but I shall remember it in a bit," the Duchess comments, suggesting that deep thought often causes forgetfulness or silence. Alice responds cautiously, implying that sometimes there might not be a moral behind an action or thought.

The Duchess emphasizes that everything has a moral if one looks hard enough, indicating a belief in underlying lessons or messages in all situations. Lewis Carroll portrays this as a whimsical yet insightful idea, reflecting the playful yet reflective tone of Alice's adventures in Wonderland. The exchange highlights the characters' perspectives on meaning and understanding in a curious, often nonsensical world.