I'm carrying a security book
Is that a book that gives you a sense of security, or is it a book about security?
It is a book all about security.
It is good to feel safe and do research on how to stay safe. If you sense any danger ahead you can reference the ideas in the book you have read.
It gives me more confidence knowing that I can provide some kind of assistance to someone if they are in danger.
It is good to be able to ensure your own security, but it can be dangerous to try to take the law into your own hands when other people are involved.  While the ideas in the book may be sound, you could get into real trouble if you try to enact them without proper licensing and training.  Just use the book as a guide to how to be safe.