There is no source of evil or illness. These are simply ideas that exist in the mind. They are not real and they cannot harm you.
You are the only one who can give them power by believing in them. If you do not believe in them, they will have no power over you.
Secondly, understand that you are not your thoughts. You are the one who is aware of your thoughts. You are the observer of your thoughts, not the thinker of your thoughts.
Thoughts are just things that come and go in the mind. They are not who you are. You are the one who is aware of your thoughts.
Lastly, know that you have the power to choose which thoughts you give attention to. You can choose to focus on positive, uplifting thoughts, or you can choose to focus on negative, destructive thoughts. It is entirely up to you.
You are also the only one who can heal yourself. No one else can do it for you. You have all the power within you to heal yourself of any illnesse or evil. Simply choose to do so, and it will be done.