Life Lessons- Again...(sigh)

Once there was a little boy high upon a mountain. It was cold and snowy. As he was going down the mountain, he met a snake. The snake begged the boy to carry him down the mountain before he died. After much deliberation, the boy reluctantly agreed. As the boy was carrying the snake, the snake begged the boy to let him inside his shirt.

The boy agreed again.

When they got to the bottom of the mountain, it had warmed up.

The boy tried to take the snake out of his shirt. As he did so, the snake bit him. As the boy laid dying, the boy looked up to the snake and asked why he had don'e that.

The snake replied, " You knew what I was when you picked me up."

Why can't I learn that lesson?