The things we allow in our live can and will influence us. So the things that leave an impression on us will eventually have evidence that it was there.
Items needed for the object lesson is:
Triplicate paper (carbon copies)
A pointed object that can leave the impression
A hard surface like a clip board
If you do not know Jesus as your Saviour please watch this film
Teens and adults - https://youtu.be/gbVqFVujkUE
Kids - https://youtu.be/2phFthHXFvY