What is the general theme in the Pact book

Friendship Can Build You Up or Tear You DownIt is shown through the pact the three doctors made. This is also shown by their stories of how some friend can easily influence us for the better or worst. This theme is also used in example that having positive friends can have a positive effect on your live and vice versa. This is shown in the examples they give of some of their old childhood friends and their selves.