A farmer walked through his field one cold winter morning. On the ground lay a snake, frozen with the cold. The farmer knew how deadly the snake could be, and yet he picked it up and put it under his shirt to warm it back to life.
The snake soon came back to life, and when it was strong enough, bit the man who had been so kind to it. The bite killed the farmer.
What can we learn from this story?
Based on the story, what do you think the English idiom "a snake in one's bosom" means?