Conversation opens our views, and gives our faculties a more vigorous play; it puts us upon turning our notions on every side, and holds them up to a light that discovers those latent flaws which would probably have lain concealed in the gloom of unagitated abstraction.
If you give somebody a lot of questions to answer and then they walk by a bowl of candy, they are more likely to grab the candy because they're tired out from answering questions and can't resist.