A week ago, you sent a boy to bathe, went through the boy's clothes, found a bag containing poison, and took it. The boy didn't notice that the poison was gone, so you could sell it to someone for a lot of money. But why did you take the poison when you had planned to sell it all along? If you were planning on selling the poison for the rest of your life, why did it suddenly become necessary to use it? It's not a big deal.