In the universe there are two kinds of entities

1.Materialistic entities which cannot think

Examples are Paper , pen , pencil, eraser , sharpener etc..,

2. Spiritual entities which can think on their own.

Examples are Human beings.

Suppose a bullet which is a materialistic entity is hit some one it pierces the body, goes inside. It doesn't bother about whom it is hitting, whether it is hitting a person or wood or animal or a material.

But we human beings are spiritual entities, suppose a doctor comes to us with knife and injection we allow him to operate on our...