Love this doctor who intro quote

As you come into this world, something else is also born. You begin your life, and it begins a journey towards you. It moves slowly, but it never stops. Wherever you go, whatever path you take, it will follow - never faster, never slower, always coming. You will run; it will walk. You will rest; it will not. One day, you will linger in the same place too long; you will sit too still or sleep too deep. And when, too late, you rise to go, you will notice a second shadow next to yours. Your life will then be over.