If you believe in sickness, just in general, you will become sick. But that's not the end of it. You'll believe other people are sick too, even if they aren't. And that means that your belief in sickness attempts to MAKE other people sick.
If you believe in attack, just in general, you will believe you are attacking. But that's not the end of it. You'll believe everyone else is attacking too. And you'll believe they're just as justified in attacking as you believe you are. Your belief in attack attacks other people by portraying them as wanting to attack you.
If you believe in guilt, just in general, you will believe you are guilty. But that's not the end of it. You'll believe that everyone is also guilty. You will perhaps think only they are guilty and not you, but you can't believe that this applies to them without it applying to you also. Your believe in your own guilt is an attempt to make others guilty also.
It happens this way because we all share One mind and One identity. What applies to any part of the "Sonship" applies to every single part of it equally. This is a whole different way of looking at rules than the ego uses. Either we are all guilty, or we are all innocent. Either everyone is to blame, or nobody is to blame. Either everyone is attacking, or nobody is attacking. There is no separating out of different people having different rules or evaluations that apply to them, separate from you.
The ego is different in that it applies SEPARATION, between you and others, creating an illusion that what applies to them does not apply to you because it's different. So now they are attacking, but you're not. Or they're guilty but you're not. Or they're sick but you're not. Or you're sick but its not attacking them. Or that your guilt is in isolation. Or that you're only attacking yourself. This is the ego's thought system of division, keeping you separate from others.
If you're in this kind of thinking - that what applies to you doesn't apply to others and vice versa, then you are definitely in the ego's mindset.
Looking at what's true in the SHARED Holy Spirit mindset will help you to get out of it. If I think someone else is guilty but I'm not, I have to admit, I believe in guilt and I must believe *I* am guilty in order to accuse them of my own sin. So I have to own up to that and take responsibility for believing I am guilty... and get that corrected. It's not true. I'm innocent, AND SO ARE THEY. This is you returning to the sonship as a whole.