You know yourself. You know all the things that everyone else knows about you, and also every secret you keep hidden — your open words and deeds and your private thoughts. Ask yourself: How much has God forgiven me?
How good is your imagination? No matter how big it is, no matter how inventive our thoughts or how many incredible things we can come up with — what God can do, what He actually can do is greater.
The devil will try to trick you, deceive you and accuse you both to yourself and others. He will lie about you and lie to you, and come up with all kinds of clever schemes to manipulate and control you. How can you stay safe from this?